HTG12B0 datasheet(7/33 Pages) HOLTEK

7 / 33 page

A.C. Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max. Unit

VDD

Conditions

fSYS

System Clock

3V R=620kW~51kW

128

1000

kHz

tCY

Cycle Time

3V fSYS=1MHz

¾ms

fTIMER Timer I/P Frequency

(TMCLK)

1000

kHz

tRES

Reset Pulse Width

¾¾

fSOUND Sound Effect Clock

¾¾

*64 or 128

kHz

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

HTG12B0

September 8, 1999

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

004H

008H

F0 0 H

FF FH

T i m e r i n t e r r upt s ubr o u t i ne

R T C i n t e r r upt s ub r out i n e

P r ogr am

RO M

B ank 1

8 bi t s

P age F l ook - u p t abl e ( 256 by t e s )

P age N l ook - up t abl e

00B H

Program memory ROMB=XX01B

000H

004H

008H

F0 0 H

FF FH

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

T i m e r i n t e r r upt s ubr o u t i ne

R T C i n t e r r upt s ub r out i n e

P r ogr am

RO M

B ank 0

8 bi t s

P age F l ook - u p t abl e ( 256 by t e s )

P age N l ook - up t abl e

00B H

Program memory ROMB=XX00B

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