參數(shù)資料
型號: GMS34004T
廠商: Hynix Semiconductor Inc.
英文描述: 4-BIT SINGLE CHIP MICROCOMPUTERS
中文描述: 4位單片機(jī)微機(jī)
文件頁數(shù): 36/49頁
文件大?。?/td> 328K
代理商: GMS34004T
4 - 5
Chapter 4. EPROM
EPROM write mode (1/2)
RESETB
OSC
12.5V
CK1
CK2
CK3
K3 ~ K0
PGM Write ( 0110 )
AH
D4 ~ D0
0000
1101
VCC
6V
0V
1000
1110
0000
1000
AL
DH
DL
AH
AL
DH
DL
OH
OL
10times Repeat
12us X 10 = 120us
Verify
Next Write
AH : High bit Address Input Latch
AL : Low bit Address Input Latch
DH : High bit Data Input Latch
DL : Low bit Data Input Latch
OH : High bit Data Output
OL : Low bit Data Output
9.5V
1
2
3
4
* Note : 1. AH, AL, DH, DL Inputs are released at 100~200nS after OSC rising edge and
width is 1OSC cycle ( if OSC is 500KHz, width is 2uS ).
2us at 500KHz
¨ ¨è
¨
¨
14.5clocks
EPROM write mode (2/2)
No
Fail
Yes
Pass
No
Fail
Pass
Yes
START
¨
Reset
(Set EPROM write mode)
Address=First address
¨è
Set address & data
¨é
EPROM write
Repeat until near 100uS.
When 500KHz OSC1, repeat 10
times (12uS*10=120uS)
RESETB=0V
VCC=0V
END
Count=0
Count ++
¨ê
Verify
Count=25
Device fail
Address ++
¨é
EPROM write
(Write one more time)
Address > Last address
EPROM read mode
Verify all
RESETB=0V
VCC=0V
Device OK
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