M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 137

• Manufacturer Part Number: M30280F6HP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

M
R
R
1
e
E
Table 12.7 Specifications in Event Counter Mode
Figure 12.19 TBiMR Register in Event Counter Mode
6
NOTE:
. v
J
1. The TB0S to TB2S bits are assigned to the bit 5 to bit 7 in the TABSR register.
12.2.2 Event Counter Mode
Count source
Count operation
Divide ratio
Count start condition
Count stop condition
Interrupt request generation timing Timer underflow
TBi
Read from timer
Write to timer
C
0
2
9
In event counter mode, the timer counts pulses from an external device or overflows and underflows of
other timers (see Table 12.7) . Figure 12.19 shows the TBiMR register in event counter mode.
2 /
0 .
B
IN
8
0
0
0
G
pin function
4
J
NOTES:
7
o r
a
Timer Bi Mode Register (i=0 to 2)
b7
0 -
. n
1. Effective when the TCK1 bit is set to “0” (input from TBiIN pin). If the TCK1 bit is set to “1” (TBj overflow or
2. The port direction bit for the TBi
Item
u
2
underflow), these bits can be set to “0” or “1”.
p
b6
3
0
, 1
(
0
M
b5
2
1
0
b4
6
0
7
C
b3
2 /
b2
, 8
page 117
b1
0 1
M
1
b0
6
• External signals input to TBi
• Timer Bj overflow or underflow (j=i-1, except j=2 if i=0)
• Decrement
• When the timer underflows, it reloads the reload register contents and
1/(n+1)
Set TBiS bit
Set TBiS bit to “0” (stop counting)
Count source input
Count value can be read by reading TBi register
• When not counting and until the 1st count source is input after counting start
• When counting (after 1st count source input)
C
continues counting
Bit Symbol
in program)
Value written to TBi register is written to both reload register and counter
Value written to TBi register is written to only reload register
(Transferred to counter when reloaded next)
TMOD0
TMOD1
2 /
f o
TCK0
TCK1
MR0
MR1
MR2
MR3
8
Symbol
TB0MR to TB2MR
3
IN
) B
8
pin must be set to “0” (= input mode).
5
Operation mode select bit
Event clock select
Count polarity select
bit
TB0MR register
Set to “0” in timer mode
When write in event counter mode, set to “0”. When read in event
counter mode, its content is indeterminate.
No effect in event counter mode.
Can be set to “0” or “1”.
TB1MR, TB2MR registers
Nothing is assigned. When write, set to “0”. When read, its
content is indeterminate.
1
to “1” (start counting)
(1)
n: set value of TBi register
Bit Name
Address
039B
16
to 039D
Specification
IN
16
0 1 : Event counter mode
b3 b2
0 0 : Counts external signal's
0 1 : Counts external signal's
1 0 : Counts external signal's
1 1 : Must not be set
0 : Input from TBi
1 : TBj overflow or underflow
b1 b0
pin (i=0 to 2) (effective edge can be selected
(j = i – 1, except j = 2 if i = 0)
After Reset
00XX0000
falling edges
rising edges
falling and rising edges
Function
2
IN
pin
0000
(2)
16
to FFFF
RW
RW
RW
RW
RW
RW
RW
RW
RO
16
12. Timer