
2004 Microchip Technology Inc.
DS30491C-page 99
PIC18F6585/8585/6680/8680
6.2.4
16-BIT MODE TIMING
Figure 6-4 shows the 16-bit mode external bus timing
for PIC18F8X8X devices.
FIGURE 6-4:
EXTERNAL PROGRAM MEMORY BUS TIMING (16-BIT MODE)
Q2
Q1
Q3
Q4
Q2
Q1
Q3
Q4
ALE
OE
3AABh
WRH
WRL
AD<15:0>
BA0
CF33h
Opcode Fetch
MOVLW
55h
from 007556h
9256h
0E55h
‘1’
Table Read
of 92h
from 199E67h
1 TCY Wait
Q2
Q1
Q3
Q4
Q2
Q1
Q3
Q4
Q2
Q1
Q3
Q4
Apparent Q
Actual Q
A<19:16>
Ch
0h