Datasheet

PIC18F87K22 FAMILY
DS39960D-page 506  2011 Microchip Technology Inc.
FIGURE 31-6: PROGRAM MEMORY FETCH TIMING DIAGRAM (8-BIT)
TABLE 31-10: PROGRAM MEMORY FETCH TIMING REQUIREMENTS (8-BIT)
Param
No
Symbol Characteristics Min Typ Max Units
150 TadV2aIL Address Out Valid to ALE  (address setup time) 0.25 TCY – 10 — — ns
151 TaIL2adl ALE
 to Address Out Invalid (address hold time) 5 — — ns
153 B
A01 BA0  to Most Significant Data Valid 0.125 TCY ——ns
154 B
A02 BA0  to Least Significant Data Valid 0.125 TCY ——ns
155 TaIL2oeL ALE
 to OE  0.125 TCY ——ns
161 ToeH2adD OE
 to A/D Driven 0.125 TCY – 5 — — ns
162 TadV2oeH Least Significant Data Valid Before OE

(data setup time)
20 — — ns
162A TadV2oeH Most Significant Data Valid Before OE

(data setup time)
0.25 TCY + 20 — — ns
163 ToeH2adI OE
 to Data in Invalid (data hold time) 0 — — ns
166 TaIH2aIH ALE
 to ALE  (cycle time) — TCY —ns
167 T
ACC Address Valid to Data Valid 0.5 TCY – 10 — — ns
168 Toe OE
 to Data Valid — — 0.125 TCY + 5 ns
170 TubH2oeH BA0 =
0 Valid Before OE  0.25 TCY ——ns
170A TubL2oeH BA0 =
1 Valid Before OE  0.5 TCY ——ns
Q1 Q2 Q3 Q4 Q1 Q2
OSC1
ALE
OE
Address
Data
170
161
162
AD<7:0>
Address
Address
A<19:8>
Address
162A
BA0
Data
170A
151
150
166
167
155
153
163
154
168
CE
Note: Fmax = 25 MHz in 8-Bit External Memory mode.