EM73P968 datasheet(17/53 Pages) EMC

17 / 53 page

* This specification are subject to be changed without notice.

EM73P968

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

8.14.2001

Preliminary

CLOCK AND TIMING GENERATOR

The clock generator is supported by a dual clock system. The high-frequency oscillator is internal oscillator.

The low-frequency oscillator may be sourced from crystal, the working frequency is 32 KHz.

CLOCK GENERATOR STRUCTURE

There are two clock generator for system clock control unit, P14 is the status register that hold the CPU

status. P16, P19 and P22 are the command register for system clock mode control.

LDL#5h;

LDH #3h;

STDMI #0Ah; RAM[35] ← Ah

(3) L register is used as a pointer to indicate the bit of I/O port for instructions : SELP, CLPL, TFPL,

(When LR = 0 indicate P4.0)

PROGRAM EXAMPLE: To set bit 0 of Port4 to "1"

LDL #00h;

SEPL ; P4.0 ← 1

STACK POINTER (SP)

Stack pointer is a 4-bit register that stores the present stack level number.

Before using stack, user must set the SP value first, CPU will not initiate the SP value after reset condition.

When a new subroutine is received, the SP is decreased by one automatically, likewise, if returning from a

subroutine, the SP is increased by one.

The data transfer between ACC and SP is done with instructions "LDASP" and "STASP".

DATA POINTER (DP)

Data pointer is a 12-bit register that stores the ROM address can indicating the ROM code data specified

by user (refer to data ROM).

High-frequency

generator

System clock

mode control

System control

RC connection

Crystal connection

LXIN

LXOUT

P14

P16

P22

P19

Low-frequency

generator

Mask option for choose Crystal or RC oscillator

XOUT

LXIN/XIN

LXOUT/XOUT

LXIN/XIN

LXOUT/XOUT

Res

Mask option for choose Crystal or RC oscillator

XIN

Res=100K for high frequency osc / Res=1M for slow frequency osc)

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