GMS81C7216 Datasheet, PDF (42/121 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C7208/7216
11. OPERATION MODE
The system clock controller starts or stops the main-frequency
clock oscillator. The operating mode is generally divided into the
main-clock mode, which is controlled by system clock mode reg-
ister (SCMR). Figure 11-1shows the operating mode transition
diagram.
System clock control is performed by the system clock mode reg-
ister, SCMR. During reset, this register is initialized to “0” so that
the main-clock operating mode is selected.
Main Clock Operating Mode
This mode is fast-frequency operating mode.
The CPU and the peripheral hardwares are operated on the high-
frequency clock. At reset release, this mode is invoked.
SLEEP Mode
In this mode, the CPU clock stops while peripherals and the os-
cillation source continue to operate normally.
STOP Mode
In this mode, the system operations are all stopped, holding the
internal states valid immediately before the stop at the low power
consumption level.
Main - Oscillating
Main-clock
Mode
Main: Stopped
STOP
Mode
Reset
RESET
Operation
Main: Oscillating
Reset
NOTE1:
RESET
Watch Timer Int.
Timer interrupt (EC0, EC2)
External Int.
SIO Int.
Watchdog Timer Int.
NOTE2: RESET
All Int.
SLEEP
Mode
Main: According to SCMR
CPU and Peripherals are stops,
CPU stops,
Peripherals are operate.
Figure 11-1 Operating Mode
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FEB. 2005 Ver 1.04