M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 264

• 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. 11.1.1 Clock generating circuit
WAIT MODE
11.1 Clock generating circuit
11–2
This chapter describes Wait mode.
Wait mode is used to stop
The oscillator continues its oscillation. The microcomputer enters Wait mode when the WIT instruction is
executed.
Wait mode can be terminated by an interrupt request occurrence or the hardware reset.
11.1 Clock generating circuit
Figure 11.1.1 shows the clock generating circuit.
Note: This is the signal generated when the watchdog timer’s most significant bit becomes “0.”
Interrupt request
Watchdog timer frequency select bit: Bit 0 at address 61
STP instruction
WIT instruction
Reset
R
R
R
S
S
S
Q
Q
Q
X
CPU
IN
and
Ready request
CPU: Central Processing Unit
BIU: Bus Interface Unit
Request of CPU wait
from BIU
(acceptance of Hold
request included)
X
OUT
1/2
when there is no need to operate the central processing unit (CPU).
7702/7703 Group User’s Manual
1
1/8
16
1/2
C PU
1/2
1/8
Hold request
f
f
512
32
f
f
f
f
2
512
16
64
Watchdog timer
frequency select bit
Operation clock for
internal peripheral devices
Watchdog timer’s
underflow signal
(Note)
Watchdog
timer