ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 40
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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8.11.6
7799D–AVR–11/10
PLLCSR – PLL Control and Status Register
Table 8-9.
• Bit 7:5 – Res: Reserved Bits
These bits are reserved bits in the ATmega8U2/16U2/32U2 and always read as zero.
• Bit 4 – DIV5 PLL Input Prescaler (1:5)
• Bit 3 – DIV3 PLL Input Prescaler (1:3)
• Bit 2 – PINDIV PLL Input Prescaler (1:1, 1:2)
These bits allow to configure the PLL input prescaler to generate the 8MHz input clock for the
PLL from either a 8 or 16 MHz input.
When using a 8 MHz clock source, this bit must be set to 0 before enabling PLL (1:1).
When using a 16 MHz clock source, this bit must be set to 1 before enabling PLL (1:2).
• Bit 3:2 – Res: Reserved Bits
These bits are reserved and always read as zero.
Bit
0x29 (0x49)
Read/Write
Initial Value
CLKPS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Clock Prescaler Select
R
7
–
0
CLKPS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
R
6
–
0
CLKPS1
R
5
–
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
DIV5
R/W
4
0
CLKPS0
ATmega8U2/16U2/32U2
DIV3
R
3
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
PINDIV
R
2
0
Clock Division Factor
PLLE
R/W
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
PLOCK
128
256
16
32
64
1
2
4
8
R
0
0
PLLCSR
40
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