參數(shù)資料
型號(hào): MR80C32E-16P883
廠商: TEMIC SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44
文件頁數(shù): 148/176頁
文件大小: 2962K
代理商: MR80C32E-16P883
73
2535J–AVR–08/10
ATtiny13
Bit 6 – FOC0B: Force Output Compare B
The FOC0B bit is only active when the WGM bits specify a non-PWM mode.
However, for ensuring compatibility with future devices, this bit must be set to zero when
TCCR0B is written when operating in PWM mode. When writing a logical one to the FOC0B bit,
an immediate Compare Match is forced on the Waveform Generation unit. The OC0B output is
changed according to its COM0B1:0 bits setting. Note that the FOC0B bit is implemented as a
strobe. Therefore it is the value present in the COM0B1:0 bits that determines the effect of the
forced compare.
A FOC0B strobe will not generate any interrupt, nor will it clear the timer in CTC mode using
OCR0B as TOP.
The FOC0B bit is always read as zero.
Bits 5:4 – Res: Reserved Bits
These bits are reserved bits in the ATtiny13 and will always read as zero.
Bit 3 – WGM02: Waveform Generation Mode
Bits 2:0 – CS02:0: Clock Select
The three Clock Select bits select the clock source to be used by the Timer/Counter.
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.
11.9.3
TCNT0 – Timer/Counter Register
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.
Table 11-9.
Clock Select Bit Description
CS02
CS01
CS00
Description
0
No clock source (Timer/Counter stopped)
00
1
clkI/O/(No prescaling)
01
0
clkI/O/8 (From prescaler)
01
1
clkI/O/64 (From prescaler)
10
0
clkI/O/256 (From prescaler)
10
1
clkI/O/1024 (From prescaler)
1
0
External clock source on T0 pin. Clock on falling edge.
1
External clock source on T0 pin. Clock on rising edge.
Bit
765
4321
0
TCNT0[7:0]
TCNT0
Read/Write
R/W
Initial Value
000
0000
0
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