EM73P968 datasheet(20/53 Pages) EMC

20 / 53 page

* This specification are subject to be changed without notice.

8.14.2001

EM73P968

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminar

GENERAL PURPOSE REGISTER (P10)

P10 is a 4-bit general purpose register which can be read, written and rested by all I/O instructions.

(including : INA, INM, OUT, OUTA, OUTM, SEP, CLP, TTP, TFP)

PROGRAM EXAMPLE:

CHIP ROM16K

;--------RAM define area-----------------

DSEG

ORG

10H

HLBUF:

RES

; HL buffer for interrupt

P9BUF:

RES

; P9 (RAM bank) buffer for interrupt

;----------Interruptsubroutine--------------------

CSEG

ORG

004H

LBR

HTCI

HTCI:

OUTA P10

; save Acc to general purpose register P10

INA

OUT

#0000B,P9

10 instruction bytes

STA

P9BUF

; save RAM bank to P9BUF

EXHL HLBUF

; save HL to HLBUF

EXHL HLBUF

; restore HLBUF to HL

LDA

P9BUF

; resotre P9BUF to RAM bank

10 instruction bytes

OUTA P9

INA

P10

; restore register P10 to Acc

RTI

STOP OPERATION MODE

The STOP operation mode suspends system operation and holds the internal status immediately before the

suspension with low power consumption. This mode will be released by reset or I/O pins (P0(0..3)/

WAKEUP 0..3, P1(0..3)/WAKEUP 4..7, P2(0..3)/WAKEUP 8..11, P4(0..3)/WAKEUP 12..15, P5(0..3)/

WAKEUP 16..19, P6(0..3)/WAKEUP 20..23, P7(0..3)/WAKEUP 24..27, P8(0..3)/WAKEUPA..D, P11

(0..3)/WAKEUP 28..31, and P15(0..3)/WAKEUP 32..35).

LCD display and high speed timer/counter with melody output are disabled in STOP mode.

Initial value : 0000

P16 3 2 1 0

SWWT

Set wake up

Stop wake up time (go to NORMAL)

1 0 0

2^9/XIN for RC osc.

1 0 1

2^10/XIN for RC osc.

1 1 0

2^18/XIN for Crystal osc.

1 1 1

2^19/XIN for Crystal osc.

EM73P968 Datasheet(PDF) 20 Page - ELAN Microelectronics Corp

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