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ATmega32A Datasheet(PDF) 269 Page - ATMEL Corporation

Part # ATmega32A
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  352 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32A Datasheet(HTML) 269 Page - ATMEL Corporation

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269
8155B–AVR–07/09
ATmega32A
26.5
Page Size
26.6
Parallel Programming Parameters, Pin Mapping, and Commands
This section describes how to parallel program and verify Flash Program memory, EEPROM
Data memory, Memory Lock bits, and Fuse bits in the ATmega32A. Pulses are assumed to be at
least 250 ns unless otherwise noted.
26.6.1
Signal Names
In this section, some pins of the ATmega32A are referenced by signal names describing their
functionality during parallel programming, see Figure 26-1 and Table 26-7. Pins not described in
the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in Table 26-9.
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in Table 26-10.
Figure 26-1. Parallel Programming
Table 26-5.
No. of Words in a Page and no. of Pages in the Flash
Flash Size
Page Size
PCWORD
No. of Pages
PCPAGE
PCMSB
16K words (32K bytes)
64 words
PC[5:0]
256
PC[13:6]
13
Table 26-6.
No. of Words in a Page and no. of Pages in the EEPROM
EEPROM Size
Page Size
PCWORD
No. of Pages
PCPAGE
EEAMSB
1024 bytes
4 bytes
EEA[1:0]
256
EEA[9:2]
9
VCC
+5V
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
PB7 - PB0
DATA
RESET
PD7
+12 V
BS1
XA0
XA1
OE
RDY/BSY
PAGEL
PA0
WR
BS2
AVCC
+5V



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