參數(shù)資料
型號： AT91M40807-33AI
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Microcontroller
中文描述： 32-BIT, MROM, 33 MHz, RISC MICROCONTROLLER, PQFP100
封裝： 1.40 MM HEIGHT, TQFP-100
文件頁數(shù)： 123/153頁
文件大?。?/td> 1837K
代理商： AT91M40807-33AI
123
AT91X40 Series
1354D
–
ATARM
–
05/02
Signal Name Description
Note:
After a hardware reset, the Timer Counter block pins are controlled by the PIO Controller. They must be configured to be con-
trolled by the peripheral before being used.
Timer Counter
Description
The three Timer Counter channels are independent and identical in operation. The reg-
isters for channel programming are listed in Table 17.
Counter
Each Timer Counter channel is organized around a 16-bit counter. The value of the
counter is incremented at each positive edge of the selected clock. When the counter
has reached the value 0xFFFF and passes to 0x0000, an overflow occurs and the bit
COVFS in TC_SR (Status Register) is set.
The current value of the counter is accessible in real-time by reading TC_CV. The
counter can be reset by a trigger. In this case, the counter value passes to 0x0000 on
the next valid edge of the selected clock.
Clock Selection
At block level, input clock signals of each channel can either be connected to the exter-
nal inputs TCLK0, TCLK1 or TCLK2, or be connected to the configurable I/O signals
TIOA0, TIOA1 or TIOA2 for chaining by programming the TC_BMR (Block Mode).
Each channel can independently select an internal or external clock source for its
counter:
Internal clock signals: MCK/2, MCK/8, MCK/32,
MCK/128, MCK/1024
External clock signals: XC0, XC1 or XC2
Channel Signal
Description
XC0, XC1, XC2
External Clock Inputs
TIOA
Capture Mode: General Purpose Input
Waveform Mode: General Purpose Output
TIOB
Capture Mode: General Purpose Input
Waveform Mode: General Purpose Input/Output
INT
Interrupt Signal Output
SYNC
Synchronization Input Signal
Block Signals
Description
TCLK0, TCLK1, TCLK2
External Clock Inputs
TIOA0
TIOA Signal for Channel 0
TIOB0
TIOB Signal for Channel 0
TIOA1
TIOA Signal for Channel 1
TIOB1
TIOB Signal for Channel 1
TIOA2
TIOA Signal for Channel 2
TIOB2
TIOB Signal for Channel 2
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