M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 258

• 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

STOP MODE
10.1 Clock generating circuit
Fig. 10.1.1 Clock generating circuit
10–2
This chapter describes Stop mode.
Stop mode is used to stop oscillation when there is no need to operate the central processing unit (CPU).
The microcomputer enters Stop mode when the STP instruction is executed.
Stop mode can be terminated by an interrupt request occurrence or the hardware reset.
10.1 Clock generating circuit
Figure 10.1.1 shows the clock generating circuit.
Note: This is the signal generated when the watchdog timer’s most significant bit becomes “0.”
Watchdog timer frequency select bit : Bit 0 at address 61
Interrupt request
STP instruction
WIT instruction
Reset
R
R
R
S
S
S
Q
Q
Q
X
IN
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
7702/7703 Group User’s Manual
1
1/8
16
1/2
CPU
1/2
1/8
Hold request
f
f
512
32
f
f
f
f
2
16
64
512
Watchdog timer frequency
select bit
Operation clock for
internal peripheral devices
Watchdog timer’s
underflow signal
(Note)
Watchdog
timer