IC80C51 Datasheet, PDF (42/44 Pages) Integrated Circuit Solution Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER

IC80C51
IC80C31
ALE
PSEN
WR
PORT 0
PORT 2
tWHLH
tLLWL
tWLWH
tAVLL
tLLAX
A7-A0 FROM RI OR DPL
tAVWL
tQVWX
DATA OUT
A15-A8 FROM DPH
tWHQX
A7-A0 FROM PCL
INSTR IN
A15-A8 FROM PCH
Figure 30. External Data Memory Write Cycle
INSTRUCTION
ALE
CLOCK
DATAOUT
DATAIN
0
1
2
3
4
5
6
7
8
tXLXL
tQVXH
0
tXHQX
1
tXHDV
VALID
VALID
2
tXHDX
VALID
3
VALID
4
VALID
5
VALID
Figure 31. Shift Register Mode Timing Waveform
6
VALID
7
SET TI
VALID
SET RI
Vcc — 0.5V
0.45V
0.7Vcc
0.2Vcc — 0.1
tCHCL
tCLCX
tCHCX
tCLCH
tCLCL
Figure 32. External Clock Drive Waveform
S3-42
Integrated Circuit Solution Inc.
MC001-0B