GMS90 Hynix Semiconductor, GMS90 Datasheet - Page 28

• Manufacturer Part Number: GMS90
• Description: 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: Hynix Semiconductor

Power Saving Modes
Two power down modes are available, the Idle Mode and Power Down Mode.
The bits PDE and IDLE of the register PCON select the Power Down mode or the Idle mode, respectively. If
the Power Down mode and the Idle mode are set at the same time, the Power Down mode takes precedence.
Table 10 gives a general overview of the power saving modes.
Table 10. Power Saving Modes Overview
In the Power Down mode of operation, V
however, that V
operating level, before the Power Down mode is terminated. The reset signal that terminates the Power Down
mode also restarts the oscillator. The reset should not be activated before V
level and must be held active long enough to allow the oscillator to restart and stabilize (similar to power-on
reset).
24
Power-Down mode
Idle mode
Mode
CC
is not reduced before the Power Down mode is invoked, and that V
ORL PCON, #01H
ORL PCON, #02H
Instruction
Entering
Example
CC
can be reduced to minimize power consumption. It must be ensured,
- Enabled interrupt
- Hardware Reset
Hardware Reset
Leaving by
CPU is gated off
CPU status registers maintain their
data.
Peripherals are active
Oscillator is stopped, contents of on-
chip RAM and SFR’s are maintained
(leaving Power Down Mode means
redefinition of SFR contents).
CC
is restored to its normal operating
CC
Remarks
Dec. 1998 Ver 3.0
is restored to its normal
GMS90 Series