Rainbow Electronics T89C51RD2 User Manual
Page 65
65
Rev. F - 15 February, 2001
T89C51RD2
Mode Name
Mode
Rst
Psen
Ale
_ _
|_|
EA
P2.6
P2.7
P3.6
P3.7
P0[7..0]
PELCK
Program or Erase Lock.
Disable the Erasure or Programming
access
1
0
_ _
|_|
1
1
0
1
0
xx
PEULCK
Program or Erase UnLock.
Enable the Erasure or Programming
access
1
0
Note3
1
1
0
1
0
55-AA
PGMC
Write Code Data (byte)
or write Page
Always precedeed by PGML
1
0
_ _
|_|
Internally
timed
1
0
1
1
1
xx
PGML
Memory Page Load
(up to 128 bytes)
1
0
Note2
1
0
1
0
1
Din
PGMV
Read Code Data (byte)
1
0
1
1
0
_ _
|_|
1
1
Dout
VSB
Read Security Byte (=HSB)
1
0
1
1
0
_ _
|_|
0
1
Dout
PGMS
Write Security Byte (Note 4)
(security byte = HSB)
1
0
10ms
1
1
1
0
0
Din
CERR
Chip Erase User + XAF
1
0
10ms
1
1
0
0
0
xx
PGXC
Write Byte or Page in Extra Memory
(XAF)
Always precedeed by PGXL
1
0
_ _
|_|
Internally
timed
1
1
1
0
1
xx
PGXL
Memory Page Load XAF
(up to 128 bytes)
1
0
Note2
1
1
1
0
1
Din
TMS
Read Signature bytes
30h (Manufacturer code)
31h (Device ID #1)
60h (Device ID #2)
61h (Device ID #3)
1
0
1
1
0
_ _
|_|
0
0
Dout =
58h
D7h
FCh
FFh
RXAF
Read Extra Memory
(XAF)
1
0
1
1
0
_ _
|_|
0
0
Dout