Not
4-51
Programming Interface
Every code byte in the Flash array can be written and the
entire array can be erased by using the appropriate combi-
nation of control signals. The write operation cycle is self-
timed and once initiated, will automatically time itself to
completion.
All major programming vendors offer worldwide support for
the Atmel microcontroller series. Please contact your local
programming vendor for the appropriate software revision.
Flash Programming Modes
Note: 1. Chip Erase requires a 10-ms PROG pulse.
Figure 3. Programming the Flash Figure 4. Verifying the Flash
Mode RST PSEN ALE/PROG EA/V
PP
P2.6 P2.7 P3.6 P3.7
Write Code Data H L 12V L H H H
Read Code Data H L H H L L H H
Write Lock Bit - 1 H L 12V H H H H
Bit - 2 H L 12V H H L L
Bit - 3HL 12VHLHL
Chip Erase H L 12V H L L L
Read Signature Byte H L H H L L L L
(1)
P1
P2.6
P3.6
P2.0 - P2.3
A0 - A7
ADDR.
OOOOH/OFFFH
T
SEE FLASH
PROGRAMMING
MODES ABLE
3-12 MHz
A8 - A11
P0
+5V
P2.7
PGM
DATA
PROG
V/V
IH PP
V
IH
ALE
P3.7
XTAL2 EA
RST
PSEN
XTAL1
GND
V
CC
AT89LV51
CC
