m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 206

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

Fig. 9.3.7 Relationship between P4OUT
9.3.5 Pin P4OUT
When a falling edge is input to pin P4OUT
becomes “0” and the pulse output pins enter the floating state. (In other words, pulse output becomes
disabled.) The pulse output pins where pulse output is to be inactive depend on the pulse output mode.
When restarting pulse output after the pulse output becomes inactive, be sure to return the input level at
pin P4OUT
level at pin P4OUT
Also, at this time, bits 0 through 7 of the port P4 direction register (address C
(Refer to section “5.2.3 Pin P4OUT
P6
When the input level at pin P4OUT
Figure 9.3.7 shows the relationship between the P4OUT
output pin.
Note that, when not making the pulse output inactive by using pin P4OUT
P4OUT
• Pulse mode 0: RTP2
• Pulse mode 1: RTP2
7
to port output pins, be sure to do as follows:
Set the port P4 direction register’s bits, corresponding to the port P4 pins in
Return the input level at pin P4OUT
Write data to the port P4 register (address A
output data.
these port pins to the output mode.
CUT
to Vcc via a resistor.
CUT
Waveform output control bit 1
(bit 7 at address A0
Pulse output pin
P4OUT
to “H” level; and then, be sure to set the waveform output control bit 1 to “1.” When the input
CUT
CUT
CUT
When the pulse output port mode is selected, the pulse outpit pins become floating.
The pulse is output by writing of “1” with the input level at pin P4OUT
When a falling edge is input to pin P4OUT
(pulse-output-cutoff signal input pin)
is “L” level, the waveform output control bit 1 cannot be “1.”
input
0
0
to RTP2
to RTP2
16
)
3
3
Programmable
I/O port
CUT
CUT
, RTP3
7905 Group User’s Manual Rev.1.0
Selection of pulse output port mode
(selected by bit s 3 to 0 at address A0
/INT
is “L” level, no bit of the port P4 direction register can be “1.”
CUT
CUT
0
0
.”) Therefore, if it is necessary to switch port pins P6
input, waveform output control bit 1, and pulse output pin
CUT
, RTP3
to “H” level.
, the waveform output control bit 1 (bit 7 at address A0
9.3 Block description of pulse output port 1
Floating
PULSE OUTPUT PORT MODE
16
1
CUT
)’s bits, corresponding to the port P4 pins which will
, this bit becomes “0.”
CUT
Pulse output
input, waveform output control bit 1, and pulse
16
)
CUT
Floating
= “H.”
CUT
, be sure to connect pin
16
) become “00000000
, to “1” in order to set
Pulse output
0
through
9-25
16
2
.”
)