M30622 Mitsubishi, M30622 Datasheet - Page 94

• Manufacturer Part Number: M30622
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: Mitsubishi

Timer B
Timer B
Figure 1.17.14. Block diagram of timer B
Figure 1.17.15. Timer B-related registers (1)
Figure 1.17.14 shows the block diagram of timer B. Figures 1.17.15 and 1.17.16 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:
But, M30623(80-pin package), timer B1 has no input pin, so funcs as the internal timer.
• 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 pulse width.
TBi
(i = 0 to 5)
IN
Timer Bi mode register
b7
Tentative Specifications REV.A
f
b6
f
f
Clock source selection
f
S
C32
8
32
1
pecifications in this manual are tentative and subject to change.
b5
b4
Can be selected in only
event counter mode
Polarity switching
and edge pulse
b3
TBj overflow
(j = i – 1. Note, however,
j = 2 when i = 0,
j = 5 when i = 3)
b2
b1
b0
• Event counter
• Timer
• Pulse period/pulse width measurement
Note 1: Timer B0, timer B3.
Note 2: Timer B1, timer B2, timer B4, timer B5.
Note 3: In the timer B1 mode register of M30623(80-pin package), do not use this mode,
Bit symbol
TMOD0
TMOD1
TCK0
TCK1
MR0
MR1
MR2
MR3
Symbol
TBiMR(i = 0 to 5) 039B
because timer B1 has no input pin.
Note 1: In M30623(80-pin package), do not select the function using TB1
Note 2: The TB5
Count source select bit
Operation mode select bit
Function varies with each operation mode
(Function varies with each operation mode)
because it is not connected to the external pin.
(address 0380
035B
Bit name
Count start flag
Counter reset circuit
IN
Address
16
16
pin is shared with the TA0
94
to 039D
to 035D
16
)
16
16
Data bus high-order bits
Data bus low-order bits
0 0 : Timer mode
0 1 : Event counter mode
1 0 : Pulse period/pulse width
1 1 : Inhibited
Reload register (16)
b1 b0
00XX0000
00XX0000
Low-order 8 bits
When reset
Counter (16)
measurement mode (Note 3)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer B0
Timer B1
Timer B2
Timer B3
Timer B4
Timer B5
IN
2
2
Function
pin, RxD
TBi
0391
0393
0395
0351
0353
0355
2
, and SCL pin.
High-order 8 bits
16
16
16
16
16
16
Address
Mitsubishi microcomputers
0390
0392
0394
0350
0352
0354
16
16
16
16
16
16
M16C / 62T Group
Timer B2
Timer B0
Timer B1
Timer B5
Timer B3
Timer B4
(Note 1)
(Note 2)
IN
TBj
R
,
W