M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 134

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

M
12.2 Timer B
R
R
1
Figure 12.15 Timer B Block Diagram
e
E
Figure 12.16 TB0MR to TB2MR Registers
6
. v
J
Figure 12.15 shows a block diagram of the timer B. Figures 12.16 and 12.17 show registers related to the
timer B.
Timer B supports the following four modes. Use the TMOD1 and TMOD0 bits in the TBiMR register (i = 0 to
2) to select the desired mode.
• Timer mode: The timer counts the internal count source.
C
0
2
2 /
• Event counter mode: The timer counts the external pulses or overflows and underflows of other timers.
• Pulse period/pulse width measurement mode: The timer measures the pulse period or pulse width of
• A/D trigger mode: The timer starts counting by one trigger until the count value becomes 0000
9
0 .
B
external signal.
This mode is used together with simultaneous sample sweep mode or delayed trigger mode 0 of A/D
converter to start A/D conversion.
8
0
0
NOTES:
Timer Bi Mode Register (i=0 to 2)
0
G
b7
4
J
NOTE:
1. Timer B0.
2. Timer B1, Timer B2.
o r
TBi
(i = 0 to 2)
7
a
b6
0 -
. n
u
1. Overflow or underflow.
IN
f
1
p
2
b5
3
or f
0
f
Clock source selection
, 1
(
C32
0
f
M
32
b4
f
2
8
2
1
0
6
TBj overflow
Can be selected in
onlyevent counter mode
b3
(j = i – 1, except j = 2 if i = 0)
0
C
7
2 /
Polarity switching,
edge pulse
b2
, 8
page 114
b1
M
b0
(1)
1
• Timer mode
• Pulse period/, pulse width measuring mode
• A/D trigger mode
• Event counter
6
Bit Symbol
C
TMOD0
TMOD1
TCK0
TCK1
MR2
2 /
MR1
MR0
MR3
f o
8
Symbol
TB0MR to TB2MR
) B
3
8
5
Count source select bit
Operation mode select bit
Bit Name
Clock selection
039B
Address
16
TABSR register
Counter reset circuit
to 039D
16
0 0 : Timer mode or A/D trigger mode
0 1 : Event counter mode
1 0 : Pulse period measurement mode,
1 1 : Do not set
Function varies with each operation
mode
Function varies with each operation
mode
b1 b0
Timer B0
Timer B1
Timer B2
pulse width measurement mode
TBi
After Reset
00XX0000
Data bus high-order bits
Data bus low-order bits
Low-order 8 bits
Reload register
Function
0391
0393
0395
Counter
2
Address
16
16
16
-
-
-
0390
0392
0394
16
16
16
Timer B2
Timer B0
Timer B1
High-order 8 bits
TBj
RW
RW
RW
RO
RW
RW
RW
RW
RW
(2)
(1)
16
12. Timer
.