GMS81C7216 Datasheet, PDF (82/121 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C7208/7216
Oscillator
(X_IN pin)
Internal Clock
External Interrupt
BIT Counter n n+1 n+2
Normal Operation
STOP Instruction
Executed
n+3
Stop Operation
01
Clear
FE FF
t_ST > 20ms
by software
012
Normal Operation
Before executing Stop instruction, Basic Interval Timer must be set
properly by software to get stabilization time which is longer than 20ms.
Figure 20-4 STOP Mode Release Timing by External Interrupt
Oscillator
(X_IN pin)
Internal Clock
RESET
BIT Counter
STOP Instruction
Executed
n n+1 n+2 n+2
Normal Operation
n+3
Stop Operation
01
Clear
FE FF 0 1 2
Normal Operation
t_ST > 62.5ms
at 4.19MHz by hardware
1
t_ST = _{fMAIN ÷1024} x 256
Figure 20-5 STOP Mode Release Timing by RESET
Minimizing Current Consumption
The stop mode is designed to reduce power consumption.
To minimize current drawn during stop mode, the user
should turn-off output drivers that are sourcing or sinking
current, if it is practical.
Note: In the STOP operation, the power dissipation asso-
ciated with the oscillator and the internal hardware is low-
ered; however, the power dissipation associated with the
pin interface (depending on the external circuitry and pro-
gram) is not directly determined by the hardware operation
of the STOP feature. This point should be little current flows
when the input level is stable at the power voltage level
(V_DD/V_SS); however, when the input level becomes higher
than the power voltage level (by approximately 0.3V), a cur-
rent begins to flow. Therefore, if cutting off the output tran-
sistor at an I/O port puts the pin signal into the high-
impedance state, a current flow across the ports input tran-
sistor, requiring it to fix the level by pull-up or other means.
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FEB. 2005 Ver 1.04