Jameco Atmel AT89C2051-24SC Manuel - Sayfa 8
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Flash Programming Modes
Mode
(1)(3)
Write Code Data
(1)
Read Code Data
Write Lock
Chip Erase
Read Signature Byte
Notes:
1. The internal PEROM address counter is reset to 000H on the rising edge of RST and is advanced by a positive pulse at
XTAL 1 pin.
2. Chip Erase requires a 10-ms PROG pulse.
3. P3.1 is pulled Low during programming to indicate RDY/BSY.
Figure 3. Programming the Flash Memory
RST/VPP
12V
H
Bit - 1
12V
Bit - 2
12V
12V
H
PP
P3.2/PROG
P3.3
L
H
L
H
H
H
(2)
H
L
Figure 4. Verifying the Flash Memory
AT89C2051
P3.4
P3.5
H
H
L
H
H
H
H
L
L
L
L
L
P3.7
H
H
H
L
L
L
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