參數(shù)資料
型號(hào): μPD789406
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 41/128頁
文件大?。?/td> 607K
代理商: ΜPD789406
41
μ
PD789405, 789406, 789407
5.4
8-Bit Timer/Event Counter
5.4.1 8-bit timer/event counter functions
Devices of the
μ
PD789407 subseries have two timer/event counters (TM0 and TM1) and one timer counter
(TM2). Readers who are seeking a description of TM2 should read the term “timer/event counter” as “timer
counter.”
The 8-bit timer/event counters (TM0, TM1, and TM2) have the following functions.
(1) 8-bit interval timer
This timer causes interrupts to be issued at specified intervals.
(2) External event counter (TM0 and TM1)
This counter is used to count the number of pulses input from an external source.
(3) Square wave output (TM2 only)
A square wave of any frequency can be output.
Table 5-6. 8-Bit Timer/Event Counter Types and Functions
TM0
TM1
TM2
Type
Interval timer
One channel
One channel
One channel
External event counter
×
Function
Timer output
×
×
Interrupt request
5.4.2 8-bit timer/event counter configuration
The 8-bit timer/event counter consists of the following hardware.
Table 5-7. 8-Bit Timer/Event Counter Configuration
Item
Configuration
Timer register
8 bits
×
3 (TM0, TM1, TM2)
Register
Compare registers: 8 bits
×
3 (CR00, CR10, CR20)
Timer output
1 (TO2)
Control register
8-bit timer mode control registers 0, 1, 2 (TMC0, TMC1, TMC2)
Port mode register 2 (PM2)
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