Information

PIC18F8722 FAMILY
DS39646C-page 402 © 2008 Microchip Technology Inc.
FIGURE 28-9: PROGRAM MEMORY WRITE TIMING DIAGRAM
TABLE 28-11: PROGRAM MEMORY WRITE TIMING REQUIREMENTS
Param.
No
Symbol Characteristics Min Typ Max Units
150 TadV2alL Address Out Valid to ALE ↓ (address setup time) 0.25 T
CY – 10 — — ns
151 TalL2adl ALE ↓ to Address Out Invalid (address hold time) 5 — — ns
153 TwrH2adl WRn
↑ to Data Out Invalid (data hold time) 5 — — ns
154 TwrL WRn
Pulse Width 0.5 TCY – 5 0.5 TCY —ns
156 TadV2wrH Data Valid before WRn
↑ (data setup time) 0.5 TCY – 10 — — ns
157 TbsV2wrL Byte Select Valid before WRn
↓ (byte select setup
time)
0.25 TCY ——ns
157A TwrH2bsI WRn ↑ to Byte Select Invalid (byte select hold time) 0.125 TCY – 5 — — ns
166 TalH2alH ALE ↑ to ALE ↑ (cycle time) — 0.25 T
CY —ns
171 TalH2csL Chip Enable Active to ALE ↓ 0.25 T
CY – 20 — — ns
171A TubL2oeH AD Valid to Chip Enable Active — — 10 ns
Q1 Q2 Q3 Q4 Q1 Q2
OSC1
ALE
Address
Data
156
150
151
153
AD<15:0>
Address
WRH or
WRL
UB or
LB
157
154
157A
Address
A<19:16>
Address
BA0
166
CE
171
171A
Operating Conditions: 2.0V < V
CC < 5.5V, -40°C < TA < +125°C unless otherwise stated.