Atmel ATmega32M1 User Manual (English)

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105

7647H–AVR–03/12

Atmel ATmega16/32/64/M1/C1

If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the

counter even if the pin is configured as an output. This feature allows software control of the

counting.

12.8.3 Timer/Counter Register – TCNT0

The Timer/Counter Register gives direct access, both for read and write operations, to the

Timer/Counter unit 8-bit counter. Writing to the TCNT0 Register blocks (removes) the Compare

Match on the following timer clock. Modifying the counter (TCNT0) while the counter is running,

introduces a risk of missing a Compare Match between TCNT0 and the OCR0x Registers.

12.8.4 Output Compare Register A – OCR0A

The Output Compare Register A contains an 8-bit value that is continuously compared with the

counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to

generate a waveform output on the OC0A pin.

12.8.5 Output Compare Register B – OCR0B

The Output Compare Register B contains an 8-bit value that is continuously compared with the

counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to

generate a waveform output on the OC0B pin.

12.8.6 Timer/Counter Interrupt Mask Register – TIMSK0

• Bits 7..3 – Res: Reserved Bits

These bits are reserved bits in the ATmega16/32/64/M1/C1 and will always read as zero.

• Bit 2 – OCIE0B: Timer/Counter Output Compare Match B Interrupt Enable

When the OCIE0B bit is written to one, and the I-bit in the Status Register is set, the

Timer/Counter Compare Match B interrupt is enabled. The corresponding interrupt is executed if

a Compare Match in Timer/Counter occurs, i.e., when the OCF0B bit is set in the Timer/Counter

Interrupt Flag Register – TIFR0.

Bit 76543210

TCNT0[7:0] TCNT0

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value00000000

Bit 76543210

OCR0A[7:0] OCR0A

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value00000000

Bit 76543210

OCR0B[7:0] OCR0B

Read/Write R/WR/WR/WR/WR/WR/WR/WR/W

Initial Value00000000

Bit 76543210

– – – – – OCIE0B OCIE0A TOIE0 TIMSK0

Read/Write R R R R R R/W R/W R/W

Initial Value 0 0 0 0 0 0 0 0

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Atmel ATmega32M1 Specifications

General

Architecture	8-bit AVR
Flash Memory	32 KB
SRAM	2 KB
EEPROM	1 KB
Clock Speed	16 MHz
GPIO Pins	32
I/O Pins	32
ADC Channels	8
ADC Resolution	10-bit
UART	1
USART	1
SPI	1
I2C	1
PWM Channels	6
CAN	1
Operating Voltage	2.7V - 5.5V
Operating Temperature	-40°C to +85°C
Temperature Range	-40°C to +85°C
Package	44-TQFP, 44-QFN