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AT90S8535 Datasheet(PDF) 93 Page - ATMEL Corporation

Part No. AT90S8535
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  127 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8535 Datasheet(HTML) 93 Page - ATMEL Corporation

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AT90S/LS8535
1041H–11/01
Parallel Programming
This section describes how to parallel program and verify Flash program memory,
EEPROM data memory, Lock bits and Fuse bits in the AT90S8535.
Signal Names
In this section, some pins of the AT90S8535 are referenced by signal names describing
their function during parallel programming. See Figure 67 and Table 37. Pins not
described in Table 37 are referenced by pin name.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a posi-
tive pulse. The bit coding are shown in Table 38.
When pulsing WR or OE, the command loaded determines the action executed. The
command is a byte where the different bits are assigned functions as shown in Table 39.
Figure 67. Parallel Programming
Table 36. Supply Voltage during Programming
Part
Serial Programming
Parallel Programming
AT90S8535
4.0 - 6.0V
4.5 - 5.5V
AT90LS8535
2.7 - 6.0V
4.5 - 5.5V
AT90S8535
VCC
+5V
RESET
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
+12 V
RDY/BSY
OE
BS
XA0
XA1
WR
PB7 - PB0
DATA


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