
Mitsubishi microcomputers
M16C / 6N0 / 6N1 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
102
Table 1.14.7. Timer specifications in event counter mode
Figure 1.14.18. Timer Bi mode register in event counter mode
(2) Event counter mode
In this mode, the timer counts an external signal or an internal timer's overflow. (See Table 1.14.7.)
Figure 1.14.18 shows the timer Bi mode register in event counter mode.
Item
Specification
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
The timer underflows
TBiIN pin function
Count source input
Read from timer
Count value can be read out by reading timer Bi register
Count source
Count operation
Write to timer
When counting stopped
When a value is written to timer Bi register, it is written to both reload register
and counter
When counting in progress
When a value is written to timer Bi register, it is written to only reload register
(Transferred to counter at next reload time)
Counts down
When the timer underflows, it reloads the reload register contents before
continuing counting
External signals input to TBiIN pin
Effective edge of count source can be a rising edge, a falling edge, or falling
and rising edges as selected by software
Count polarity select
bit (Note 1)
Invalid in event counter mode.
This bit can neither be set nor reset. When read in event
counter mode, its content is indeterminate.
0 0 : Counts external signal’s
falling edges
0 1 : Counts external signal’s
rising edges
1 0 : Counts external signal’s
falling and rising edges
1 1 : Must not be set
b3 b2
Nothing is assigned (i = 1, 2, 4, 5).
This bit can neither be set nor reset. When read, its content is
indeterminate.
Note 1: Valid only when input from the TBiIN pin is selected as the event clock.
If timer’s overflow is selected, this bit can be "0" or "1".
Note 2: Timer B0, timer B3.
Note 3: Timer B1, timer B2, timer B4, timer B5.
Note 4: Set the corresponding port direction register to "0".
Invalid in event counter mode.
Can be "0" or "1".
Event clock select
0 : Input from TBiIN pin (Note 4)
1 : TBj overflow
(j = i – 1; however, j = 2 when i = 0,
j = 5 when i = 3)
0 (Fixed to "0" in event counter mode; i = 0, 3)
(Note 2)
(Note 3)
Timer Bi mode register
Symbol
Address
When reset
TBiMR(i = 0 to 5) 039B16 to 039D16
00XX00002
01DB16 to 01DD16
00XX00002
Bit name
Function
Bit symbol
W
R
b7
b6
b5
b4
b3
b2
b1
b0
0 1 : Event counter mode
b1 b0
TCK1
MR3
MR2
MR1
TMOD1
MR0
TMOD0
TCK0
Operation mode select bit
1
0
Timer B