PIC18F6620 Microchip, PIC18F6620 Datasheet - Page 78

• Manufacturer Part Number: PIC18F6620
• Description: Microcontroller
• Manufacturer: Microchip

PIC18F6520/8520/6620/8620/6720/8720
6.2.4
The presentation of control signals on the external
memory bus is different for the various operating
modes. Typical signal timing diagrams are shown in
Figure 6-4 through Figure 6-6.
FIGURE 6-4:
FIGURE 6-5:
DS39609B-page 76
AD<15:0>
A<19:16>
Instruction
Execution
Memory
AD<15:0>
A<19:16>
Cycle
ALE
OE
CE
Instruction
Execution
Memory
16-BIT MODE TIMING
WRH
Apparent Q
WRL
Cycle
BA0
ALE
OE
CE
Actual Q
Q1
‘0’
‘1’
‘1’
EXTERNAL MEMORY BUS TIMING FOR
EXTERNAL MEMORY BUS TIMING FOR
MICROCONTROLLER MODE)
Opcode Fetch
from 000100h
INST(PC-2)
Q2
TBLRD *
Q1
Q1
3AABh
TBLRD Cycle 1
Q3
Opcode Fetch
from 007556h
Q2
Q2
MOVLW 55h
00h
Q4
Q3
Q3
0E55h
Q1
TBLRD Cycle 1
Opcode Fetch
Q4
Q4
from 000102h
MOVLW 55h
Q2
Q1
Q1
Q3
CF33h
Q4
Q2
Q2
Q1
Q3
Q3
CF33h
from 199E67h
TBLRD Cycle 2
from 199E67h
TBLRD Cycle 2
Table Read
TBLRD
TBLRD
TBLRD 92h
Q2
of 92h
Q4
Q4
0Ch
Q3
0Ch
(MICROPROCESSOR MODE)
(EXTENDED
9256h
Q4
Q1
Q4
9256h
 2004 Microchip Technology Inc.
Q4
Q2
1 T
Q1
CY
Opcode Fetch
from 000104h
Wait
ADDLW 55h
Q4
Q3
Q2
MOVLW
Q3
Q4
Q4
Q4
‘1’
‘1’
‘0’