參數(shù)資料
型號： EM73MA89B
英文描述： Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-EPSOIC T&R
中文描述： 4，液晶產(chǎn)品位微控制器
文件頁數(shù)： 8/64頁
文件大小： 331K
代理商： EM73MA89B
16
* This specification are subject to be changed without notice.
10.15.2002 (V1.3)
EM73MA89B
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
Preliminary
High-frequency
generator
System clock
mode control
fc
fs
System control
Crystal connection
LXIN
LXOUT
P14
P16
P22
P19
Low-frequency
generator
LXIN
LXOUT
CLK
open
VDD
R
RC oscillator connection
R=2.2M
LXIN
LXOUT
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).
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