ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 250
ATmega32U2
Manufacturer Part Number
ATmega32U2
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U2
Flash (kbytes)
32 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
22
Ext Interrupts
20
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
5
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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25.6
25.6.1
7799D–AVR–11/10
Parallel Programming Parameters, Pin Mapping, and Commands
Signal Names
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.
In this section, some pins of the ATmega8U2/16U2/32U2 are referenced by signal names
describing their functionality during parallel programming, see
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
When pulsing WR or OE, the command loaded determines the action executed. The different
commands are shown in
Figure 25-1. Parallel Programming
Note:
Table 25-9.
Programming Mode
Signal Name in
RDY/BSY
1. Unused Pins should be left floating.
BS1
XA0
XA1
WR
OE
Pin Name Mapping
Table
RDY/BSY
Pin Name
Table
PAGEL
+12 V
BS2
PD1
PD2
PD3
PD4
PD5
PD6
BS1
XA0
XA1
WR
OE
25-13.
25-12.
(1)
I/O
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
XTAL1
GND
O
PC6
I
I
I
I
I
Function
0: Device is busy programming, 1: Device is ready for
new command.
Output Enable (Active low).
Write Pulse (Active low).
Byte Select 1.
XTAL Action Bit 0
XTAL Action Bit 1
ATmega8U2/16U2/32U2
PB7:0
AVCC
VCC
+5V
+5V
Figure 25-1
DATA
and
Table
25-9. Pins
250
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