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HTG12B0

4-Bit Microcontroller

Holtek Semiconductor 

HTG12B0

A.C. Characteristics

Ta=25°C

Symbol

Parameter

fSYS

tCY

fTIMER

tRES

fSOUND

System Clock

Cycle Time

Timer I/P Frequency

(TMCLK)

Reset Pulse Width

Sound Effect Clock

Test Conditions

VDD Conditions

3V R=620kW~51kW

3V fSYS=1MHz

3V

¾

¾

¾

¾

¾

Min.

Typ. Max. Unit

128

¾

1000 kHz

¾

4

¾

ms

0

¾

1000 kHz

5

¾

¾ ms

¾ *64 or 128 ¾ kHz

*: Only these two clocking signal frequencies are supported by the Holtek sound library.

Functional Description

Program counter - PC

This counter addresses the program ROM and

is arranged as a 12-bit binary counter from PC0

to PC11 whose contents specify a maximum of 4096

addresses. The program counter counts with an

increment of 1 or 2 with each execution of an instruc-

tion.

When executing the jump instruction (JMP,

JNZ, JC, JTMR,...), a subroutine call, initial re-

set, internal interrupt, RTC interrupt or re-

turning from a subroutine, the program

counter is loaded with the corresponding in-

struction data as shown in the table.

Note: P0~P11: Instruction code

@: PC11 keeps current value

S0~S11: Stack register bits

ROMB0 and ROMB1 are set to 0 at

power on reset.

Program memory - ROM

The program memory is the executable memory

and is arranged in a 4096´8-bit format. There

are four banks for program memory in

HTG12B0, each bank shown in the figure can be

switched by assigning ROMB0 and ROMB1 (bit0

and bit1 of ROMB). ROMB is the ROM bank

pointer and can be written only by executing

²MOV ROMB, A² instruction. Bit 2 and bit 3 of

ROMB are unused bits. The address is specified

by the program counter (PC). Four special loca-

tions are reserved as described next.

· Location 000H: (Bank 0)

Activating the processor RES pin causes the

first instruction to be fetched from location 0.

000H

R e s e t in itia l p r o g r a m

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 0

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=XX00B

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 1

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=XX01B

7

September 8, 1999

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