m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 166

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

Fig. 8.4.2 Structure of particular function select register 1
8.4.1 Count source
For timer B2 in the event counter mode, a count source (an external signal into the TB2
be selected by using the timer B2 clock source select bit. (See Figure 8.4.2.) Timers B0 and B1 count the
external signals input to the TB0
When fX
O pins of other internal peripheral devices, which are multiplexed.
Particular function select register 1 (Address 63
Notes 1: At power-on reset, this bit becomes “0.” At hardware reset or software reset, this bit retains the value just before reset.
Bit
0
1
2
3
4
5
6
7
32
2: Even when “1” is written, the bit status will not change.
3: Setting this bit to “1” must be performed just before execution of the WIT instruction. Also, after the wait state is termi-
4: When using timer B2 in the pulse period/pulse width measurement mode, be sure to clear this bit to “0.”
is selected as the count source, the TB2
nated, this bit must be cleared to “0” immediately.
STP-instruction-execution
status bit
WIT-instruction-execution
status bit
Fix this bit to “0.”
System clock stop select bit
at WIT
Fix this bit to “0.”
The value is “0” at reading.
Timer B2 clock source select bit
(Valid in event counter mode.)
The value is “0” at reading.
Bit name
(Note 3)
(Note 4)
IN
and TB1
7905 Group User’s Manual Rev.1.0
0 : External signal input to the TB2
1 : fX
0 : Normal operation.
1 : During execution of WIT instruction
0 : In the wait mode, system clock f
1 : In the wait mode, system clock f
0 : Normal operation.
1 : During execution of STP instruction
IN
pins, respectively.
32
is counted.
16
)
IN
pin serves as a programmable I/O port pin or as I/
Function
IN
pin is counted.
sys
sys
is active.
is inactive.
8.4 Event counter mode
b7 b6 b5 b4 b3 b2 b1 b0
0
(Note 1)
(Note 1)
At reset
IN
0
0
0
0
0
0
TIMER B
pin, or fX
0
(Note 2)
(Note 2)
RW
RW
RW
RW
RW
RW
—
—
32
) can
8-15