參數(shù)資料
型號(hào): M30220MA
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(yè)數(shù): 76/212頁(yè)
文件大小: 2891K
代理商: M30220MA
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Timer A
deeopmen
Preliminary Specifications REV.E
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30220 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
76
Item
Specification
Count source
Count operation
f
1
, f
8
, f
32
, f
C132
The timer counts down
When the count reaches 0000
16
, the timer stops counting after reloading a new count
If a trigger occurs when counting, the timer reloads a new count and restarts counting
1/n n : Set value
An external trigger is input
The timer overflows
The one-shot start flag is set (= 1)
A new count is reloaded after the count has reached 0000
16
The count start flag is reset (= 0)
Interrupt request generation timing
The count reaches 0000
16
TAi
IN
pin function
Programmable I/O port or trigger input
TAi
OUT
pin function
Programmable I/O port or pulse output
Read from timer
When timer Ai register is read, it indicates an indeterminate value
Write to timer
When counting stopped
When a value is written to timer Ai register, it is written to both reload
register and counter
When counting in progress
When a value is written to timer Ai register, it is written to only reload register
(Transferred to counter at next reload time)
Divide ratio
Count start condition
Count stop condition
Table 1.13.4. Timer specifications in one-shot timer mode
Figure 1.13.12. Timer Ai mode register in one-shot timer mode
(3) One-shot timer mode
In this mode, the timer operates only once. (See Table 1.13.4.) When a trigger occurs, the timer starts up
and continues operating for a given period. Figure 1.13.12 shows the timer Ai mode register in one-shot
timer mode.
Bit name
Timer Ai mode register
Symbol
TAiMR(i = 0 to 4) 0396
16
to 039A
16
TAiMR(i = 5 to 7) 0356
16
to 0358
16
Address
When reset
00
16
00
16
Function
Bit symbol
TMOD0
b7
b6
b5
0
b4
b3
b2
b1
1 0
b0
Operation mode select bit
1 0 : One-shot timer mode
b1 b0
TMOD1
MR0
Pulse output function
select bit
0 : Pulse is not output
(TA
iOUT
pin is a normal port pin)
1 : Pulse is output (Note 1)
(TAi
OUT
pin is a pulse output pin)
MR2
MR1
MR3
0 (Must always be “0” in one-shot timer mode)
0 0 : f
1
0 1 : f
8
1 0 : f
32
1 1 : f
C132
b7 b6
TCK1
TCK0
Count source select bit
0 : One-shot start flag is valid
1 : Selected by event/trigger select
register
Trigger select bit
External trigger select
bit (Note 2)
0 : Falling edge of TAi
IN
pin's input signal (Note 3)
1 : Rising edge of TAi
IN
pin's input signal (Note 3)
Note 1: The settings of the corresponding port register and port direction register are invalid.
Note 2: Valid only when the TA
iIN
pin is selected by the event/trigger select bit
(addresses 0342
16
, 0343
16
, 0382
16
and 0383
16
). If timer overflow is selected,
this bit can be “1” or “0” .
Note 3: Set the corresponding port direction register to “0” (input mode).
W
R
AA
A
A
AA
AA
A
AA
A
A
A
A
A
A
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