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ATmega32U2 Scheda tecnica(PDF) 250 Page - ATMEL Corporation

Il numero della parte ATmega32U2
Spiegazioni elettronici  8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller
PDF  314 Pages
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32U2 Scheda tecnica(HTML) 250 Page - ATMEL Corporation

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250
7799B–AVR–07/09
ATmega8U2/16U2/32U2
25.6
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 ATmega8U2/16U2/32U2. Pulses are
assumed to be at least 250 ns unless otherwise noted.
25.6.1
Signal Names
In this section, some pins of the ATmega8U2/16U2/32U2 are referenced by signal names
describing their functionality during parallel programming, see Figure 25-1 and Table 25-9. 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 25-12.
When pulsing WR or OE, the command loaded determines the action executed. The different
commands are shown in Table 25-13.
Figure 25-1. Parallel Programming
(1)
Note:
1. Unused Pins should be left floating.
Table 25-9.
Pin Name Mapping
Signal Name in
Programming Mode
Pin Name
I/O
Function
RDY/BSY
PD1
O
0: Device is busy programming, 1: Device is ready for
new command.
OE
PD2
I
Output Enable (Active low).
WR
PD3
I
Write Pulse (Active low).
BS1
PD4
I
Byte Select 1.
XA0
PD5
I
XTAL Action Bit 0
XA1
PD6
I
XTAL Action Bit 1
VCC
+5V
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
PB7:0
DATA
RESET
PD7
+12 V
BS1
XA0
XA1
OE
RDY/BSY
PAGEL
PC6
WR
BS2
AVCC
+5V



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