Microchip Technology DV164136 Data Sheet
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 T
CY
– 5
0.5 T
CY
—
ns
156
TadV2wrH Data Valid before WRn
↑ (data setup time)
0.5 T
CY
– 10
—
—
ns
157
TbsV2wrL Byte Select Valid before WRn
↓ (byte select setup
time)
0.25 T
CY
—
—
ns
157A
TwrH2bsI
WRn
↑ to Byte Select Invalid (byte select hold time)
0.125 T
CY
– 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 < T
A
< +125°C unless otherwise stated.