參數(shù)資料
型號(hào)： DS89C420-QCL
英文描述： Ultra-High-Speed Microcontroller
中文描述： 超高速微控制器
文件頁(yè)數(shù)： 20/59頁(yè)
文件大小： 539K
代理商： DS89C420-QCL
DS89C420
20 of 59
Table 5.
Parallel Programming Instruction Set
INSTRUCTION
P2.5:0,
P1.7:0
P0.7:0
PROG
P2.6
P2.7
P3.6
P3.7
OPERATION
Mass Erase
Don’t care
Don’t care
PL
(1)
H
L
L
L
Mass erase the 16k x 8 program
memory, the security block and the
bank select. The contents of every
memory location is returned to FFh.
Write Program
Memory
Read Program
Memory
Write
Encryption
Array
ADDR
DIN
PL
(3)
L
H
H
H
Program the 16k program memory.
ADDR
DOUT
H
(4)
L
L
H
H
Verify the 16k program memory.
ADDR
DIN
PL
(3)
L
H
L
H
Program the 64 byte encryption
array.
Write LB1
Don’t care
Don’t care
PL
(3)
H
H
H
H
Program LB1 to logic 0.
Write LB2
Don’t care
Don’t care
PL
(3)
H
H
L
L
Program LB2 and LB1 to 00b.
Write LB3
Don’t care
Don’t care
PL
(3)
H
L
H
L
Program LB3, LB2, and LB1 to
000b.
Verify the lock bits. The lock bits
are at address 40h and the three
LSBs of the DOUT are the logic
value of the lock bits LB3, LB2,
and LB1, respectively.
Program the option control register.
Bit 3 of the DIN represents the
watchdog POR default setting.
Erase the option control register.
This operation disables the watch-
dog reset function on power-up.
30h = Manufacturer ID
31h = Device ID
60h = Device extension
FCh = Verify the option control
register. Bit 3 of the DOUT is the
logic value of the watchdog POR.
Read Lock Bits
Don’t care
DOUT
H
(4)
L
L
L
H
Write Option
Control
Register
Erase Option
Control
Register
Don’t care
DIN
PL
(3)
L
H
L
L
Don’t care
Don’t care
PL
(2)
H
L
L
H
Read Address
30, 31, 60, FC
ADDR
DOUT
H
(4)
L
L
L
L
1)
Mass erase requires an active-low
PROG
pulse width of 828ms.
2)
Erase option control register requires an active-low
PROG
pulse width of 828ms.
3)
Byte program requires an active-low
PROG
pulse width of 100 s max.
4)
PROG
is weakly pulled to a high internally.
Note 1:
P3.2 is pulled low during programming to indicate Busy. P3.2 is pulled high again when programming is completed to indicate Ready.
Note 2:
P3.0 is pulled high during programming to indicate an error.
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