HT48C10 datasheet(16/59 Pages) HOLTEK

16 / 59 page

ing the programmer to use the structure easily.

Likewise, if the stack is full and a CALL is

subsequently executed, a stack overflow will

occur and the first entry will be lost (only the

most recent four return addresses will be

stored).

Data memory – RAM

The data memory (RAM) is composed of bits

ranging from 81

×8, 113×8, 184×8, or 255×8, de-

pending on the microcontroller chosen

(HT48C10/ HT48C30/HT48C50/HT48C70). It is

divided into two functional groups, i.e., special

function registers and general purpose data

memory (of 64

×8, 96×8, 160×8, or 224×8 bits,

depending on the microcontroller selected

(HT48C10/ HT48C30/HT48C50/HT48C70).

Most components of the two functional groups

are readable/writable, but some are read-only.

Of the two functional groups, the special func-

tion registers of the four microcontrollers con-

sist of a program counter lower-order byte

05H), a table pointer (TBLP;07H), a table

higher-order byte register (TBLH;08H), a

status register (STATUS;0AH), an interrupt

control register (INTC;0BH), a watchdog timer

option setting register (WDTS;09H), an indirect

addressing register (00H), a memory pointer

(TMR;0DH), a timer/event counter control reg-

ister

(TMRC;0EH),

I/O

re gisters

(PA;12H,PB;14H, PC;16H), and I/O control reg-

isters (PAC;13H,PBC;15H,PCC;17H). But of

the HT48C50/HT48C70, the following compo-

nents are further divided into two or several

sub-components. First, the indirect addressing

indirect addressing register 0 (00H) and indi-

rect addressing register 1 (02H). Second, the

memory pointer register is also comprised by

two registers involving memory pointer register

0 (MP0;01H) and memory pointer register 1

(MP1;03H). Third, the timer/event counter reg-

ister is organized by two registers according to

different orders of byte, namely timer/event

higher-order byte register and timer/event

lower-order byte register, both of which are fur-

ther divided into timer/event counter 0 higher-

order byte register (TMR0H; 0CH), timer/ event

counter

higher-order

byte

(TMR1H;0FH), timer/event counter 0 lower-or-

der

byte

re gister

(TMR0L;0DH),

and

timer/event counter 1 lower-order byte register

(TMR1L;10H). Fourth, the timer/event counter

control register is divided into two registers

involving timer/event counter 0 control register

RAM mapping

HT48CXX/HT48RXX

25th May ’99

HT48C10 Datasheet(PDF) 16 Page - Holtek Semiconductor Inc

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