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HTG12B0

4-Bit Microcontroller

Holtek Semiconductor 

HTG12B0

· Location 004H: (Bank 0~3)

Contains the timer interrupt resulting from a

TIMER overflow. If the interrupt is enabled, the

CPU begins execution at location 004H.

· Location 008H: (Bank 0~3)

Activating the RTC of the processor with the

interrupts enabled causes the program to

jump to this location.

· Locations n00H to nFFH: (Bank 0~3)

Each page in the program memory consists of

256 bytes. This area from n00H to nFFH and

F00H to FFFH can be used as a look-up table.

Instructions such as READ R4A, READ

MR0A, READF R4A, READF MR0A can read

the table and transfer the contents of the ta-

ble to ACC and R4 or to ACC and a data mem-

ory address specified by the register pair

R1,R0. However as R1,R0 can only store 8

bits, these instructions cannot fully specify

the full 12 bit program memory address. For

this reason a jump instruction should first be

used to place the program counter in the right

page. The above instructions can then be used

to read the look up table data.

Note that the page number n must be greater

than zero since some locations in page 0 are re-

served for specific usage. This area may func-

tion as normal program memory.

The program memory mapping is shown in the

diagram.

In the execution of an instruction, the program

counter is added before the execution phase, so

careful manipulation of READ MR0A and

READ R4A is required in the page margin.

000H

004H

T im e r in te r r u p t s u b r o u tin e

008H

R T C in te r r u p t s u b r o u tin e

00B H

P a g e N lo o k - u p ta b le

P ro g ra m

ROM

B ank 2

F00H

P a g e F lo o k - u p ta b le ( 2 5 6 b y te s )

FFFH

8 b its

Program memory ROMB=XX10B

000H

004H

T im e r in te r r u p t s u b r o u tin e

008H

R T C in te r r u p t s u b r o u tin e

00B H

P a g e N lo o k - u p ta b le

P ro g ra m

ROM

B ank 3

F00H

P a g e F lo o k - u p ta b le ( 2 5 6 b y te s )

FFFH

8 b its

Program memory ROMB=XX11B

Mode

PC13 PC12 PC11 PC10 PC9

Initial

reset

ROMB1 ROMB0 0

0

0

Internal

interrupt

ROMB1 ROMB0 0

0

0

RTC

interrupt

ROMB1 ROMB0 0

0

0

Jump, call

instruction

ROMB1 ROMB0

P11

P10

P9

Conditional

branch

ROMB1 ROMB0

@

P10 P9

Return from

subroutine

ROMB1

ROMB0

S11

S10

S9

Program Counter

PC8 PC7 PC6 PC5

0

0

0

0

0

0

0

0

0

0

0

0

P8 P7 P6 P5

P8 P7 P6 P5

S8 S7 S6 S5

PC4

0

0

0

P4

P4

S4

PC3

0

0

1

P3

P3

S3

PC2

0

1

0

P2

P2

S2

PC1

0

0

0

P1

P1

S1

PC0

0

0

0

P0

P0

S0

Program memory

8

September 8, 1999

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