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PIC18F6520-I Datasheet, PDF (327/380 Pages) Micrel Semiconductor – 64/80-Pin High-Performance, 256 Kbit to 1 Mbit Enhanced Flash Microcontrollers with A/D | |||
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PIC18F6520/8520/6620/8620/6720/8720
TABLE 26-9: CLKO AND I/O TIMING REQUIREMENTS
Param
No.
Symbol
Characteristics
Min
Typ
Max
Units
150 TADV2ALL Address Out Valid to ALE â (address
setup time)
0.25 TCY â 10
â
â
ns
151 TALL2ADL ALE â to Address Out Invalid (address hold time)
5
â
â
ns
155 TALL2OEL ALE â to OE â
10
0.125 TCY
â
ns
160 TADZ2OEL AD high-Z to OE â (bus release to OE)
0
â
â
ns
161 TOEH2ADD OE â to AD Driven
0.125 TCY â 5
â
â
ns
162 TADV2OEH LS Data Valid before OE â (data setup time)
20
â
â
ns
163 TOEH2ADL OE â to Data In Invalid (data hold time)
0
â
â
ns
164 TALH2ALL ALE Pulse Width
â
0.25 TCY
â
ns
165 TOEL2OEH OE Pulse Width
0.5 TCY â 5 0.5 TCY
â
ns
166 TALH2ALH ALE â to ALE â (cycle time)
â
TCY
â
ns
167 TACC
Address Valid to Data Valid
0.75 TCY â 25
â
â
ns
168 TOE
OE â to Data Valid
â
0.5 TCY â 25 ns
169 TALL2OEH ALE â to OE â
0.625 TCY â 10 â 0.625 TCY + 10 ns
171 TALH2CSL Chip Enable Active to ALE â
â
â
10
ns
171A TUBL2OEH AD Valid to Chip Enable Active
0.25 TCY â 20
â
â
ns
FIGURE 26-10: PROGRAM MEMORY WRITE TIMING DIAGRAM
Q1
Q2
OSC1(1)
A<19:16>
BA0
AD<15:0>
ALE
CE
WRH or
WRL
UB or
LB
Address
150
151
171
171A
157
Q3
Q4
Address
166
Data
153
156
154
Q1
Q2
Address
Address
157A
Operating Conditions: 2.0V < VCC < 5.5V, -40°C < TA < +125°C unless otherwise stated.
Note 1: Maximum speed of FOSC is 25 MHz for external program memory read.
 2004 Microchip Technology Inc.
DS39609B-page 325
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