参数资料
型号: MT80C31-30R
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 30 MHz, MICROCONTROLLER, PQFP44
封装: 1 MM HEIGHT, QFP-44
文件页数: 139/170页
文件大小: 4133K
代理商: MT80C31-30R
70
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on. The same renaming applies for modes
that set the TOV0 flag at BOTTOM.
Figure 11-14. Timer/Counter Timing Diagram, no Prescaling
Figure 11-15 on page 70 shows the same timing data, but with the prescaler enabled.
Figure 11-15. Timer/Counter Timing Diagram, with Prescaler (f
clk_I/O/8)
11.10 Accessing 16-bit Registers
The TCNT0, OCR0A/B, and ICR0 are 16-bit registers that can be accessed by the AVR CPU via the 8-bit data bus.
The 16-bit register must be byte accessed using two read or write operations. Each 16-bit timer has a single 8-bit
register for temporary storing of the high byte of the 16-bit access. The same temporary register is shared between
all 16-bit registers within each 16-bit timer. Accessing the low byte triggers the 16-bit read or write operation. When
the low byte of a 16-bit register is written by the CPU, the high byte stored in the temporary register, and the low
byte written are both copied into the 16-bit register in the same clock cycle. When the low byte of a 16-bit register is
TOVn (FPWM)
and ICFn (if used
as TOP)
OCRnx
(Update at TOP)
TCNTn
(CTC and FPWM)
TCNTn
(PC and PFC PWM)
TOP - 1
TOP
TOP - 1
TOP - 2
Old OCRnx Value
New OCRnx Value
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
Tn
(clk
I/O/1)
clk
I/O
TOVn(FPWM)
and ICF n(if used
as TOP)
OCRnx
(Update at TOP)
TCNTn
(CTC and FPWM)
TCNTn
(PC and PFC PWM)
TOP - 1
TOP
TOP - 1
TOP - 2
Old OCRnx Value
New OCRnx Value
TOP - 1
TOP
BOTTOM
BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O/8)
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