
Under
development
Preliminary Specifications REV.D
Specifications in this manual are tentative and subject to change.
Mitsubishi Microcomputers
M16C/80 group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer A
102
Item
Specification
Count source
f1, f8, f32, fC32
Count operation
The timer counts down
When the count reaches 000016, the timer stops counting after reloading a
new count
If a trigger occurs when counting, the timer reloads a new count and restarts counting
Divide ratio
1/n
n : Set value
Count start condition
An external trigger is input
The timer overflows
The one-shot start flag is set (= 1)
Count stop condition
A new count is reloaded after the count has reached 000016
The count start flag is reset (= 0)
Interrupt request generation timing The count reaches 000016
TAiIN pin function
Programmable I/O port or trigger input
TAiOUT pin function
Programmable I/O port or pulse output (Setting by the corresponding function
select registers A and B)
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)
Table 1.13.4. Timer specifications in one-shot timer mode
Figure 1.13.10. 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 1.13.10 shows the timer Ai mode register in one-shot timer mode.
Bit name
Timer Ai mode register
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
Operation mode select bit
1 0 : One-shot timer mode
b1 b0
TMOD1
TMOD0
MR0
MR2
MR1
MR3
0 (Set to “0” in one-shot timer mode)
0 0 : f1
0 1 : f8
1 0 : f32
1 1 : fC32
b7 b6
TCK1
TCK0
Count source select bit
10
0
0 : One-shot start flag is valid
1 : Selected by event/trigger select
register
Trigger select bit
External trigger select
bit (Note 1)
0 : Falling edge of TAiIN pin's input signal (Note 2)
1 : Rising edge of TAiIN pin's input signal (Note 2)
Note 1: Valid only when the TAiIN pin is selected by the event/trigger select bit
(addresses 034216 and 034316). If timer overflow is selected, this bit can be “1” or “0”.
Note 2: Set the corresponding port function select register to I/O port, and port direction
register to “0”.
W
R
Symbol
Address
When reset
TAiMR(i=0 to 4)
035616 to 035A16 00000X002
This bit is invalid in M16C/80 series.
Port output control is set by the function select registers A and B.
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