HT46R12

A/D Type 8-Bit OTP MCU

Rev. 1.00

November 1, 2005

General Description

The device are 8-bit, high performance, RISC architec-
ture microcontroller devices specifically designed for
A/D applications that interface directly to analog signals,
such as those from sensors.

The advantages of low power consumption, I/O flexibil-
ity, programmable frequency divider, timer functions,
oscillator options, multi-channel A/D Converter, HALT

and wake-up functions, enhance the versatility of these
devices to suit a wide range of A/D application possibili-
ties such as sensor signal processing.

The device also provides two comparators and a pro-
grammable pulse generator (PPG), hence, it is particu-
larly suitable for use in products such as induction
cooker and home appliances.

Features

Operating voltage:
f

SYS

=4MHz: 2.2V~5.5V

SYS

=8MHz: 3.3V~5.5V

16 bidirectional I/O lines

Two 8-bit programmable timer/event counter with
overflow interrupt and 7-stage prescaler

One 8-bit programmable pulse generators (PPG)
output channel, with prescaler and 8-bit program-
mable timer counter, and supports active low or
active high output

On-chip crystal and RC oscillator

Watchdog Timer

2048

´14 program memory

´8 data memory RAM

Supports PFD for sound generation

HALT function and wake-up feature reduce power
consumption

Up to 0.5

ms instruction cycle with 8MHz system

clock at V

=5V

8-level subroutine nesting

4 channels 9-bit resolution A/D converter

Two comparators with interrupt function

Bit manipulation instruction

14-bit table read instruction

63 powerful instructions

All instructions in one or two machine cycles

Low voltage reset function

24-pin SKDIP/SOP package

Technical Document

Tools Information

FAQs

Application Note

HA0004E HT48 & HT46 MCU UART Software Implementation Method

HA0005E Controlling the I2C bus with the HT48 & HT46 MCU Series

HA0011E HT48 & HT46 Keyboard Scan Program

HA0013E HT48 & HT46 LCM Interface Design

HA0101E Using the HT46R12 in an Induction Cooker

Block Diagram

Pin Assignment

HT46R12

Rev. 1.00

November 1, 2005

O S C 2

O S C 1

R E S

V D D

M U X

P A C

P A

P o r t A

P o r t B

V S S

P r o g r a m

R O M

P r o g r a m

C o u n t e r

I n t e r r u p t

C i r c u i t

S t a c k

I N T C

D a t a

M e m o r y

I n s t r u c t i o n

R e g i s t e r

I n s t r u c t i o n

D e c o d e r

S T A T U S

A L U

S h i f t e r

A C C

M P

L V R

W D T O S C

W D T

P F D 0

P F D 1

S Y S

/ 4

S Y S

P r e s c a l e r

T M R 0

S Y S

/ 4

T M R 1

T M R 0 C

T M R 0

T M R 1 C

T M R 1

P P G

S Y S

P r e s c a l e r

P P G 0 C

P P G T 0

P C 0 / C 0 V I N -

P C 1 / C 0 V I N +

P C 2 / C 0 O U T

P C 3 / C 1 O U T

P o r t C

P C C

P C

4 - C h a n n e l

A / D C o n v e r t e r

P B C

P B

P A 0 ~ P A 2

P A 3 / P F D

P A 4 / T M R 0

P A 5 , P A 6

P A 7 / T M R 1

P B 0 / A N 0 ~ P B 3 / A N 3

P P G 0 C

P P G

H A L T

E N / D I S

T i m i n g

G e n e r a t o r

H T 4 6 R 1 2

2 4 S K D I P - A / S O P - A

P B 1 / A N 1
P B 0 / A N 0

P A 3 / P F D

P A 2
P A 1
P A 0

C 1 V I N +

C 1 V I N -

P C 3 / C 1 O U T
P C 2 / C 0 O U T

V S S

P C 1 / C 0 V I N +

P B 2 / A N 2
P B 3 / A N 3
P A 4 / T M R 0
P A 5
P A 6
P A 7 / T M R 1
O S C 2
O S C 1
V D D
R E S
P P G
P C 0 / C 0 V I N -

2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3

1
2
3
4
5
6
7
8
9
1 0
1 1
1 2

Pin Description

Pin Name

I/O

Options

Description

PA0~PA2
PA3/PFD
PA4/TMR0
PA5, PA6
PA7/TMR1

I/O

Pull-high

Wake-up

PA3 or PFD

Bidirectional 8-bit input/output port. Each bit can be configured as wake-up in-
put by options. Software instructions determine the CMOS output or Schmitt
trigger input with or without pull-high resistor (determined by pull-high options: bit
option). The PA3, PA4 and PA7 are pin-shared with PFD, TMR0 and TMR1 re-
spectively.

PB0/AN0
PB1/AN1
PB2/AN2
PB3/AN3

I/O

Pull-high

Bidirectional 4-bit input/output port. Software instructions determine the
CMOS output, Schmitt trigger input with or without pull-high resistor (deter-
mined by pull-high option: bit option) or A/D input.
Once a PB line is selected as an A/D input (by using software control), the I/O
function and pull-high resistor are disabled automatically.

PC0/C0VIN-
PC1/C0VIN+
PC2/C0OUT
PC3/C1OUT
C1VIN-
C1VIN+

I/O

Pull-high

I/O or

Comparator

Bidirectional 4-bit input/output port. Software instructions determine the
CMOS output, Schmitt trigger input with or without pull-high resistor (deter-
mine by pull-high option: port option).
PC0, PC1 and PC2 are pin-shared with C0VIN-, C0VIN+ and C0OUT respec-
tively. Once the Comparator 0 function is used, the internal registers related to
PC0, PC1 and PC2 cannot be used, and the I/O function and pull-high resistor
are disabled automatically. Software instructions determine the Comparator 0
function to be used.
C1VIN+ and C1VIN- are Comparator 1 input, C1OUT is pin-shared with PC3.
Once the Comparator 1 function is used, the internal registers related to PC3
cannot be used, and the I/O function and pull-high resistor are disabled auto-
matically. Software instructions determine the Comparator 1 function to be
used.

PPG

Programmable pulse generator output pin, the pin is floating when the power is
first turned on. The PPG0 output level (active low or active high) can be se-
lected via configuration option.

OSC1
OSC2

Crystal

or RC

OSC1, OSC2 are connected to an RC network or a Crystal (determined by op-
tions) for the internal system clock. In the case of RC operation, OSC2 is the
output terminal for 1/4 system clock.

RES

Schmitt trigger reset input. Active low.

VDD

Positive power supply

VSS

Negative power supply, ground.

Absolute Maximum Ratings

Supply Voltage ...........................V

-0.3V to V

+6.0V

Storage Temperature ............................

-50°C to 125°C

Input Voltage..............................V

-0.3V to V

+0.3V

Operating Temperature...........................

-40°C to 85°C

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.

HT46R12

Rev. 1.00

November 1, 2005

D.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Conditions

Operating Voltage

¾ f

SYS

=4MHz

2.2

5.5

¾ f

SYS

=8MHz

3.3

5.5

DD1

Operating Current
(Crystal OSC)

No load, f

SYS

=4MHz

ADC disable

0.6

1.5

DD2

Operating Current
(RC OSC)

No load, f

SYS

=4MHz

ADC disable

0.8

1.5

2.5

DD3

Operating Current
(Crystal OSC, RC OSC)

No load, f

SYS

=8MHz

ADC disable

STB1

Standby Current
(WDT Enabled)

No load, system HALT

STB2

Standby Current
(WDT Disabled)

No load, system HALT

IL1

Input Low Voltage for I/O Ports,
TMR0 and TMR1

0.3V

IH1

Input High Voltage for I/O Ports,
TMR0 and TMR1

0.7V

IL2

Input Low Voltage (RES)

0.4V

IH2

Input High Voltage (RES)

0.9V

LVR

Low Voltage Reset

2.7

3.3

I/O Port Sink Current

=0.1V

I/O Port Source Current

=0.9V

-2

-4

=0.9V

-5

-10

Pull-high Resistance

100

A/D Input Voltage

A/D Conversion Error

±0.5

±1

LSB

ADC

Additional Power Consumption
if A/D Converter is Used

0.5

1.5

Comparator Input Offset Voltage

-10

Comparator Input Voltage Range

0.2

-0.8

HT46R12

Rev. 1.00

November 1, 2005

A.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Conditions

SYS

System Clock

¾ 2.2V~5.5V

400

4000

kHz

¾ 3.3V~5.5V

400

8000

kHz

TIMER

Timer I/P Frequency
(TMR0/TMR1)

¾ 2.2V~5.5V

4000

kHz

¾ 3.3V~5.5V

8000

kHz

WDTOSC

Watchdog Oscillator Period

180

130

RES

External Reset Low Pulse Width

SST

System Start-up Timer Period

Power-up or Wake-up
from HALT

1024

SYS

INT

Interrupt Pulse Width

A/D Clock Period

ADC

A/D Conversion Time

ADCS

A/D Sampling Time

COMP

Comparator Response Time

Note: *t

SYS

=1/f

SYS

HT46R12

Rev. 1.00

November 1, 2005

Part Number HT46R12

Document Outline