EM73983 datasheet(13/40 Pages) EMC

13 / 40 page

* This specification are subject to be changed without notice.

EM73983

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

10.31.2000

CLOCK AND TIMING GENERATOR

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

oscillator, the working frequency is 4.6 MHz. The low-frequency oscillator may be sourced from crystal or

RC oscillator as defined by mask option, 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

Crystal connection

LXIN

open

LXOUT

P14

P16

P22

P19

Low-frequency

generator

LXIN

CLK

LXOUT

LXIN

LXOUT

VDD

RC oscillator connection

R=1.2M

Ω

EM73983 Datasheet(PDF) 13 Page - ELAN Microelectronics Corp

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