uPSD3212A, uPSD3212C, uPSD3212CV
140/163
Figure 71. External Program Memory READ CycleTable 116. External Program Memory AC Characteristics (with the 5V MCU Module)Note: 1. Conditions (in addition to those in Table 109., page133, VCC = 4.5 to 5.5V ): VSS = 0V; CL for Port 0, ALE an d PSEN o utput is 100p F;
CL for other outputs is 80pF
2. Interfacing the uPSD321x Devices to devices wi th float times up to 20ns is permissible. This limited bus content ion does not cause
any damage to Port 0 drivers.
Symbol Parameter(1) 40MHz Oscillato r Variable Oscillator
1/tCLCL = 24 to 40MHz Unit
Min Max Min Max
tLHLL ALE pulse width 35 2tCLCL – 15 ns
tAVLL Address set up to ALE 10 tCL CL – 15 ns
tLLAX Address hold after ALE 10 tCL CL – 15 ns
tLLIV ALE Low to valid instruction in 55 4tCLCL – 45 ns
tLLPL ALE to PSEN 10 tCLCL �� 15 ns
tPLPH PSEN pulse width 60 3tCLCL – 15 ns
tPLIV PSEN to valid instruction in 30 3tCLCL – 45 ns
tPXIX Input instruction hold after PSEN 00ns
tPXIZ(2) Input instruction float after PSEN 15 tCLCL – 10 ns
tPXAV(2) Address valid after PSEN 20 tCLCL – 5 ns
tAVIV Address to valid instruction in 70 5tCLCL – 55 ns
tAZPL Address float to PSEN –5 –5 ns
tAVLL tPLPH
tPXIZ
tAVIV
PSEN
PORT 2
PORT 0
AI06848
tLHLL
ALE
tLLPL
A0-A7
tLLAX
tAZPL
tLLIV
tPLIV
A0-A7
tPXAV
tPXIX
A8-A11
INSTR
IN
A8-A11