M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 163

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Fig. 6.5.3 Operation during pulse period measurement
(2) Timer Bi overflow flag
Reload register
The timer Bi interrupt request occurs when the measurement pulse’s valid edge is input or the
counter overflows. The timer Bi overflow flag is used to identify the cause of the interrupt request,
that is, whether it is an overflow occurrence or an effective edge input.
The timer Bi overflow flag is set to “1” by an overflow. Accordingly, the cause of the interrupt request
occurrence is identified by checking the timer Bi overflow flag in the interrupt routine. When a value
is written to the timer Bi mode register with the count start bit = “1,” the timer Bi overflow flag is
cleared to “0” at the next count timing of the count source
The timer Bi overflow flag is a read-only bit.
Use the timer Bi interrupt request bit to detect the overflow timing. Do not use the timer Bi overflow
flag to do that.
Figure 6.5.3 shows the operation during pulse period measurement. Figure 6.5.4 shows the operation
during pulse width measurement.
Timing at which counter is
Timer Bi overflow flag
Note: The above applies when measurement is performed for an interval from one falling to the next falling
Measurement pulse
Counter is initialized by completion of measurement.
Counter overflow.
cleared to “0000
Timer Bi interrupt
of the measurement pulse.
Transfer timing
Count start bit
Count source
request bit
counter
16
”
“H”
“L”
“1”
“0”
“1”
“0”
“1”
“0”
7702/7703 Group User’s Manual
6.5 Pulse period/pulse width measurement mode
Cleared to “0” when interrupt request is accepted or
cleared by software.
(undefined value)
Transferred
(measured value)
Transferred
TIMER B
6–25