UPSD3254 STMICROELECTRONICS [STMicroelectronics], UPSD3254 Datasheet - Page 153

• Manufacturer Part Number: UPSD3254
• Description: Flash Programmable System Devices with 8032 Microcontroller Core
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Figure 76. External Data Memory READ Cycle
Figure 77. External Data Memory WRITE Cycle
PORT 0
PORT 2
PORT 0
PORT 2
PSEN
PSEN
ALE
ALE
WR
RD
tAVLL
tAVLL
tLHLL
tLHLL
A0-A7 from
RI or DPL
A0-A7 from
RI or DPL
tLLAX
tAVWL
tAVWL
tLLAX2
tLLWL
tLLWL
P2.0 to P2.3 or A8-A11 from DPH
P2.0 to P2.3 or A8-A11 from DPH
tAVDV
UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV
tLLDV
tQVWX
tRLDV
tRLAZ
tQVWH
tWLWH
tRLRH
DATA OUT
DATA IN
tWHQX
tRHDZ
tWHLH
tWHLH
tRHDX
A0-A7 from PCL
A0-A7 from PCL
A8-A11 from PCH
A8-A11 from PCH
INSTR IN
INSTR IN
AI07088
AI07089
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