ATTINY25-20SUR Atmel, ATTINY25-20SUR Datasheet - Page 93

• Manufacturer Part Number: ATTINY25-20SUR
• Description: MCU AVR 2KB FLASH 20MHZ 8SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY25-20SUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12.3.2
2586M–AVR–07/10
GTCCR – General Timer/Counter1 Control Register
• Bits 3:0 - CS1[3:0]: Clock Select Bits 3, 2, 1, and 0
The Clock Select bits 3, 2, 1, and 0 define the prescaling source of Timer/Counter1.
Table 12-5.
The Stop condition provides a Timer Enable/Disable function.
• Bit 6 – PWM1B: Pulse Width Modulator B Enable
When set (one) this bit enables PWM mode based on comparator OCR1B in Timer/Counter1
and the counter value is reset to $00 in the CPU clock cycle after a compare match with OCR1C
register value.
• Bits 5:4 – COM1B[1:0]: Comparator B Output Mode, Bits 1 and 0
The COM1B1 and COM1B0 control bits determine any output pin action following a compare
match with compare register B in Timer/Counter1. Since the output pin action is an alternative
function to an I/O port, the corresponding direction control bit must be set (one) in order to con-
trol an output pin.
Bit
0x2C
Read/Write
Initial value
CS13
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Timer/Counter1 Prescale Select
TSM
R/W
7
0
CS12
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
PWM1B
R/W
6
0
COM1B1
CS11
R/W
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
5
0
COM1B0
R/W
4
0
CS10
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
FOC1B
W
3
0
Asynchronous
Clocking Mode
T/C1 stopped
PCK
PCK/2
PCK/4
PCK/8
PCK/16
PCK/32
PCK/64
PCK/128
PCK/256
PCK/512
PCK/1024
PCK/2048
PCK/4096
PCK/8192
PCK/16384
FOC1A
W
2
0
PSR1
R/W
1
0
Synchronous
Clocking Mode
T/C1 stopped
CK
CK/2
CK/4
CK/8
CK/16384
CK/16
CK/32
CK/64
CK/128
CK/256
CK/512
CK/1024
CK/2048
CK/4096
CK/8192
PSR0
R/W
0
0
GTCCR
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