HT95C20P datasheet(9/50 Pages) HOLTEK

9 / 50 page

HT95C200/20P/300/30P

Rev. 0.10

October 1, 2002

Preliminary

tion will be within 256 locations. When a control transfer

takes place, an additional dummy cycle is required.

Program memory

- ROM

The program memory is used to store the program in-

structions which are to be executed. It also contains

data, table, and interrupt entries, and is organized into

8192

´16 bits, addressed by the program counter and ta-

ble pointer. Certain locations in the program memory are

reserved for special usage:

· Location 0000H

This area is reserved for the initialization program. Af-

ter chip power-on reset or external reset or WDT

time-out reset, the program always begins execution

at location 0000H.

· Location 0004H

This area is reserved for the external interrupt service

program. If the INT/TMR1 input pin is activated, the

external interrupt is enabled and the stack is not full,

the program begins execution at location 0004H.

· Location 0008H

This area is reserved for the Timer/Event Counter 0 in-

terrupt service program. If a timer interrupt results

from a Timer/Event Counter 0 overflow, the

Timer/Event Counter 0 interrupt is enabled and the

stack is not full, the program begins execution at loca-

tion 0008H.

· Location 000CH

This location is reserved for the Timer/Event Counter

1 interrupt service program. If a timer interrupt results

from a Timer/Event Counter 1 overflow, the

Timer/Event Counter 1 interrupt is enabled and the

stack is not full, the program begins execution at loca-

tion 000CH.

· Location 0010H

This location is reserved for the peripherals interrupt

service program. The peripherals include a DTMF

generator and FSK decoder. When the DTMF genera-

tor is operated in burst mode, it will generate an inter-

rupt after 1 burst cycle is finished. When the FSK

decoder detects a ringer or line reversal or FSK carrier

signal or FSK packet data, the FSK interrupt is also

generated. If these interrupts occurred, the peripheral

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 0010H. The pro-

grammer could distinguish from these interrupts from

the DTMFC and FSKS register.

· Location 0014H

This location is reserved for real time clock (RTC) in-

terrupt service program. When RTC generator is en-

abled and time-out occurs, the RTC interrupt is

enabled and the stack is not full, the program begins

execution at location 0014H.

· Location 0018H

This location is reserved for the HKS pin edge transi-

tion or HDI pin falling edge transition or HFI pin rising

edge transition. If this condition occurs, the dialer I/O

interrupt is enabled and the stack is not full, the pro-

gram begins execution at location 18H.

Table location

Any location in the ROM space can be used as look-up

tables. The instructions

²TABRDC [m]² (the current

page, one page=256 words) and

²TABRDL [m]² (the last

page) transfer the contents of the lower-order byte to the

specified data memory, and the higher-order byte to

TBLH (08H). Only the destination of the lower-order

byte in the table is well-defined, and the higher-order

byte of the table word is transferred to TBLH. The table

Instruction(s)

Table Location

*12

*11

*10

TABRDC [m]

P12

P11

P10

TABRDL [m]

Note: *12~*0: Table location bits

P12~P8: Current program counter bits

@7~@0: Table pointer bits

0 0 0 H

0 0 4 H

0 0 8 H

D e v i c e i n i t i a l i z a t i o n p r o g r a m

E x t e r n a l i n t e r r u p t s u b r o u t i n e

T i m e r / e v e n t c o u n t e r 0 i n t e r r u p t s u b r o u t i n e

P r o g r a m

R O M

1 6 b i t s

L o o k - u p t a b l e ( 2 5 6 w o r d s )

n 0 0 H

L o o k - u p t a b l e ( 2 5 6 w o r d s )

1 . . . H

N o t e : n r a n g e s f r o m 0 t o 1 E H

n . . H

T i m e r / e v e n t c o u n t e r 1 i n t e r r u p t s u b r o u t i n e

0 0 C H

P e r i p h e r a l i n t e r r u p t s u b r o u t i n e

0 1 0 H

R T C i n t e r r u p t s u b r o u t i n e

0 1 4 H

D i a l e r I / O i n t e r r u p t s u b r o u t i n e

0 1 8 H

Program memory

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