m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 94

• Manufacturer Part Number: m30262f8gp
• Description: Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

Timer B
88
Timer B
Figure 1.13.16. Block diagram of timer B
Figure 1.13.17. Timer B-related registers (1)
TBi
(i = 0 to 2)
Figure 1.13.16 shows the block diagram of timer B. Figures 1.13.17 and 1.13.18 show the timer B-related
registers.
Use the timer Bi mode register (i = 0 to 2) bits 0 and 1 to choose the desired mode.
Timer B has three operation modes listed as follows:
Timer Bi mode register
b7
IN
pulse width.
f
• Timer mode: The timer counts an internal count source.
• Event counter mode: The timer counts pulses from an external source or a timer overflow.
• Pulse period/pulse width measuring mode: The timer measures an external signal's pulse period or
1
b6
or f
f
f
f
Clock source selection
C32
8
32
b5
2
b4
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative and subject to change.
b3
Can be selected in only
event counter mode
Polarity switching
and edge pulse
b2
TBj overflow
( j = i 1. Note, however,
j = 2 when i = 0)
b1
b0
Note 1: Timer B0.
Note 2: Timer B1, timer B2.
Bit symbol
TMOD0
TMOD1
TCK0
TCK1
MR0
MR1
MR2
MR3
Event counter
Timer
Pulse period/pulse width measurement
Symbol
TBiMR(i = 0 to 2) 039B
Count source select bit
Operation mode select bit
Function varies with each operation mode
Renesas Technology Corp.
(Function varies with each operation mode)
Bit name
Clock selection
Address
16
to 039D
(address 0380
Count start flag
Counter reset circuit
16
0 0 : Timer mode
0 1 : Event counter mode
1 0 : Pulse period/pulse width
1 1 : Must not be set.
b1 b0
00XX0000
When reset
Timer B0
Timer B1
Timer B2
16
measurement mode
)
TBi
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
2
Function
Data bus high-order bits
Data bus low-order bits
0391
0393
0395
Reload register (16)
Low-order 8 bits
Counter (16)
16
16
16
Address
0390
0392
0394
16
16
16
M16C/26 Group
Timer B2
Timer B0
Timer B1
TBj
(Note 1)
(Note 2)
R
High-order 8 bits
W