參數(shù)資料
型號: M30201
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機(jī)
文件頁數(shù): 49/159頁
文件大小: 2319K
代理商: M30201
Unde
Timer A
deeopmen
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
49
Timer A
Figure 1.37 shows the block diagram of timer A. Figures 1.38 to 1.40 show the timer A-related registers.
Use the timer A0 mode register bits 0 and 1 to choose the desired mode.
Timer A has the four operation modes listed as follows:
Timer mode: The timer counts an internal count source.
Event counter mode: The timer counts pulses from an external source or a timer over flow.
One-shot timer mode: The timer stops counting when the count reaches “0000
16
”.
Pulse width modulation (PWM) mode: The timer outputs pulses of a given width.
Figure 1.38. Timer A-related registers (1)
Figure 1.37. Block diagram of timer A
Count start flag
Up count/down count
Always down count except
in event counter mode
Reload register (16)
Counter (16)
Low-order
8 bits
AAA
High-order
8 bits
Clock source
selection
Timer
(gate function)
Timer
One shot
PWM
f
1
f
8
f
32
f
C32
External
trigger
TA0
IN
TB1 overflow
Event counter
Clock selection
TX0 overflow
Pulse output
Toggle flip-flop
TA0
OUT
Data bus low-order bits
Data bus high-order bits
Up/down flag
Down count
TX2 overflow
Polarity
selection
Timer A0 mode register
Symbol
TA0MR
Address
0396
16
When reset
00
16
Bit name
Function
Bit symbol
TMOD0
W
R
b7
b6
b5
b4 b3
b2
b1
b0
0 0 : Timer mode
0 1 : Event counter mode
1 0 : One-shot timer mode
1 1 : Pulse width modulation
(PWM) mode
b1 b0
TCK1
MR3
MR2
MR1
TMOD1
MR0
TCK0
Function varies with each operation mode
Count source select bit
(Function varies with each operation mode)
Operation mode select bit
AA
AA
AA
AA
AA
AA
AA
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