參數(shù)資料
型號: GPTRM
英文描述: General-Purpose Timer Reference Manual
中文描述: 通用定時(shí)器參考手冊
文件頁數(shù): 13/90頁
文件大?。?/td> 647K
代理商: GPTRM
GPT
REFERENCE MANUAL
FUNCTIONAL OVERVIEW
MOTOROLA
1-1
SECTION 1FUNCTIONAL OVERVIEW
The general-purpose timer (GPT), a module in Motorola's family of modular microcon-
trollers, is a simple yet flexible 11-channel timer for use in systems where a moderate
level of CPU control is required. The GPT can be broken into several nearly indepen-
dent submodules: the compare/capture unit, the pulse accumulator, and the pulse-
width modulation unit.
Figure 1-1
is a block diagram of the GPT.
Figure 1-1 GPT Block Diagram
The compare/capture unit features three input capture channels, four output compare
channels, and one channel that can be selected as an input capture or output compare
channel. These channels share a 16-bit free-running counter (TCNT) which derives its
clock from a nine-stage prescaler or from the external clock input pin, PCLK.
The pulse accumulator channel logic includes its own 8-bit counter and can operate in
either event counting mode or gated time accumulation mode.
The pulse-width modulation submodule has two outputs that are periodic waveforms
whose duty cycles may be independently selected and modified by user software. The
PWM unit has its own 16-bit free-running counter which is clocked by an output of the
nine-stage prescaler (the same prescaler used by the compare/capture unit) or by the
clock input pin, PCLK.
IMB
PULSE ACCUMULATOR
PWM UNIT
BUS INTERFACE
COMPARE/CAPTURE UNIT
PRESCALER
IC1/GP0
IC2/GP1
IC3/GP2
PCLK
PWMB
PWMA
PAI
IC4/OC5/OC1/GP7
OC4/OC1/GP6
OC3/OC1/GP5
OC2/OC1/GP4
OC1/GP3
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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