m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 155

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

TIMER B
8.2 Block description
Fig. 8.2.2 Structure of count start register 0
Fig. 8.2.3 Structure of timer Bi mode register
8-4
8.2.2 Count start register
This register is used to start and stop counting. One bit of this register corresponds to one timer. (This is
the one-to-one relationship.) Figure 8.2.2 shows the structure of the count start register 0.
8.2.3 Timer Bi mode register
Figure 8.2.3 shows the structure of the timer Bi mode register. The operating mode select bits are used
to select the operating mode of timer Bi. Bits 2 to 7 have different functions according to the operating
mode. These bits are described in the paragraph of each operating mode.
Note: Bit 5 is invalid in the timer and event counter modes; its value is undefined at reading.
Timer Bi mode register (i = 0 to 2) (Addresses 5B
Count start register 0 (Address 40
Bit
Bit
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Operating mode select bits
These bits have different functions according to the operating mode.
Timer A0 count start bit
Timer A1 count start bit
Timer A2 count start bit
Timer A3 count start bit
Timer A4 count start bit
Timer B0 count start bit
Timer B1 count start bit
Timer B2 count start bit
Bit name
Bit name
16
)
7905 Group User’s Manual Rev.1.0
b1 b0
0 0 : Timer mode
0 1 : Event counter mode
1 0 : Pulse period/Pulse width measurement mode
1 1 : Do not select.
0 : Stop counting
1 : Start counting
16
to 5D
16
)
Function
Function
b7 b6 b5 b4 b3 b2 b1 b0
b7 b6 b5 b4 b3 b2 b1 b0
At reset
Undefined
At reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(Note)
R/W
RW
RW
RW
RW
RW
RW
RW
R/W
RO
RW
RW
RW
RW
RW
RW
RW
RW