PIC18F6520/8520/6620/8620/6720/8720
6.2.4
16-BIT MODE TIMING
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:
Apparent Q
Actual Q
EXTERNAL MEMORY BUS TIMING FOR
TBLRD
(MICROPROCESSOR MODE)
Q1
Q1
Q2
Q2
00h
Q3
Q3
Q4
Q4
Q1
Q1
Q2
Q2
Q3
Q3
Q4
Q4
Q4
Q1
0Ch
Q4
Q2
Q4
Q3
Q4
Q4
A<19:16>
AD<15:0>
BA0
ALE
OE
WRH
WRL
CE
鈥?鈥?/div>
鈥?鈥?/div>
鈥?鈥?/div>
3AABh
0E55h
CF33h
9256h
鈥?鈥?/div>
鈥?鈥?/div>
鈥?鈥?/div>
1 T
CY
Wait
Memory
Cycle
Instruction
Execution
Opcode Fetch
MOVLW
55h
from 007556h
TBLRD
Cycle 1
Table Read
of 92h
from 199E67h
TBLRD
Cycle 2
FIGURE 6-5:
EXTERNAL MEMORY BUS TIMING FOR
TBLRD
(EXTENDED
MICROCONTROLLER MODE)
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
A<19:16>
AD<15:0>
CE
ALE
OE
Memory
Cycle
Instruction
Execution
Opcode Fetch
TBLRD *
from 000100h
INST(PC-2)
Opcode Fetch
MOVLW
55h
from 000102h
TBLRD
Cycle 1
CF33h
0Ch
9256h
TBLRD
92h
from 199E67h
Opcode Fetch
ADDLW
55h
from 000104h
MOVLW
TBLRD
Cycle 2
DS39609B-page 76
铮?/div>
2004 Microchip Technology Inc.
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