參數(shù)資料
型號: M30201MX-XXXFP
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): 52/159頁
文件大小: 1496K
代理商: M30201MX-XXXFP
Unde
Timer A
deeopmen
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
52
Item
Specification
Count source
Count operation
f
1
, f
8
, f
32
, fc
32
Down count
When the timer underflows, it reloads the reload register contents before
continuing counting
1/(n+1)
n : Set value
Count start flag is set (= 1)
Count start flag is reset (= 0)
When the timer underflows
Programmable I/O port or gate input
Programmable I/O port or pulse output
Count value can be read out by reading timer A0 register
When counting stopped
When a value is written to timer A0 register, it is written to both reload register and counter
When counting in progress
When a value is written to timer A0 register, it is written to only reload register
(Transferred to counter at next reload time)
Gate function
Counting can be started and stopped by the TA0
IN
pin’s input signal
Pulse output function
Each time the timer underflows, the TA0
OUT
pin’s polarity is reversed
Divide ratio
Count start condition
Count stop condition
Interrupt request generation timing
TA0IN pin function
TA0OUT pin function
Read from timer
Write to timer
Select function
(1) Timer mode
In this mode, the timer counts an internally generated count source. (See Table 1.13.) Figure 1.41 shows
the timer A0 mode register in timer mode.
Table 1.13. Specifications of timer mode
Figure 1.41. Timer A0 mode register in timer mode
Note 1: Set the corresponding port direction register to “1” (output mode).
Note 2: The bit can be “0” or “1”.
Note 3: Set the corresponding port direction register to “0” (input mode).
Timer A0 mode register
b7
b6
b5
b4
b3
0
Symbol
TA0MR
Address
0396
16
When reset
00
16
Bit name
Function
Bit symbol
W
R
b2 b1
b0
Operation mode
select bit
0 0 : Timer mode
TMOD1
MR0
TMOD0
Pulse output function
select bit
0 : Pulse is not output
(TA0
OUT
pin is a normal port pin)
1 : Pulse is output (Note 1)
(TA0
OUT
pin is a pulse output pin)
Gate function select bit
0 X
(Note 2)
: Gate function not available
(TA0
IN
pin is a normal port pin)
1 0 : Timer counts only when TA0
IN
pin
is held “L” (Note 3)
1 1 : Timer counts only when TA0
IN
pin
is held “H” (Note 3)
MR2
MR1
MR3
0 (Must always be fixed to “0” in timer mode)
1
0 1 : f
8
1 0 : f
32
1 1 : f
C32
b7 b6
TCK1
TCK0
Count source select bit
0 0
AA
AA
A
A
AA
A
AA
AA
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