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Under
development
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer X
Item
Specification
Count source
f1, f8, f32, fC32
Count operation
Down count
When the timer underflows, it reloads the reload register contents before continuing counting
Divide ratio
1/(n+1)
n : Set value
Count start condition
Count start flag is set (= 1)
Count stop condition
Count start flag is reset (= 0)
Interrupt request generation timing
When the timer underflows
TXiINOUT pin function
Programmable I/O port, gate input or pulse output
Read from timer
Count value can be read out by reading timer Xi register
Write to timer
When counting stopped
When a value is written to timer Xi register, it is written to both reload register and counter
When counting in progress
When a value is written to timer Xi register, it is written to only reload register
(Transferred to counter at next reload time)
Select function
Gate function
Counting can be started and stopped by the TXiINOUT pin’s input signal
Pulse output function
Each time the timer underflows, the TXiINOUT pin’s polarity is reversed
(1) Timer mode
In this mode, the timer counts an internally generated count source. (See Table 1.21.) Figure 1.60 shows
the timer Xi mode register in timer mode.
Table 1.21. Specifications of timer mode
Figure 1.60. Timer Xi mode register in timer mode
Note 1: Set the corresponding port direction register to “1” (output mode). Gate function
cannot be selected when pulse output function is selected.
Note 2: The bit can be “0” or “1”.
Note 3: Set the corresponding port direction register to “0” (input mode). Pulse output
function cannot be selected when gate function is selected.
Timer Xi mode register
Symbol
Address
When reset
TXiMR(i = 0 to 2) 039716 to 039916
0016
Bit name
Function
Bit symbol
W
R
b7
b6
b5
b4
b3
b2 b1
b0
Operation mode
select bit
0 0 : Timer mode
b1 b0
TMOD1
TMOD0
MR0
Pulse output function
select bit
0 : Pulse is not output
(TXiINOUT pin is a normal port pin)
1 : Pulse is output (Note 1)
(TXiINOUT pin is a pulse output pin)
Gate function select bit
0 X (Note 2): Gate function not available
(TXiINOUT pin is a normal port pin)
1 0 : Timer counts only when TXiINOUT
pin is held “L” (Note 3)
1 1 : Timer counts only when TXiINOUT
pin is held “H” (Note 3)
b4 b3
MR2
MR1
MR3
0 (Must always be fixed to “0” in timer mode)
0 0 : f1
0 1 : f8
1 0 : f32
1 1 : fC32
b7 b6
TCK1
TCK0
Count source select bit
00
0