at89c51ac3-s3sim ATMEL Corporation, at89c51ac3-s3sim Datasheet - Page 129

• Manufacturer Part Number: at89c51ac3-s3sim
• Description: At89c51ac3 Enhanced 8-bit Microcontroller With 64kb Flash Memory
• Manufacturer: ATMEL Corporation

External Data Memory Write Cycle
External Data Memory Read Cycle
Serial Port Timing – Shift Register Mode
4383D–8051–02/08
PORT 0
PORT 2
PORT 0
PORT 2
PSEN
ALE
ALE
PSEN
WR
RD
OR SFR-P2
OR SFR-P2
ADDRESS
ADDRESS
Table 79. Symbol Description (F = 40 MHz)
Symbol
T
T
T
T
T
XLXL
QVHX
XHQX
XHDX
XHDV
A0-A7
A0-A7
T
T
LLAX
T
T
LLAX
AVWL
AVWL
T
T
LLWL
LLWL
T
AVDV
T
LLDV
ADDRESS A8-A15 OR SFR P2
ADDRESS A8-A15 OR SFR P2
T
T
QVWX
RLAZ
T
QVWH
T
DATA OUT
T
WLWH
RLRH
Parameter
Serial port clock cycle time
Output data set-up to clock rising edge
Output data hold after clock rising edge
Input data hold after clock rising edge
Clock rising edge to input data valid
DATA IN
T
T
T
WHLH
WHLH
RHDX
T
T
RHDZ
WHQX
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