Section 28
Power-Down Modes
Rev. 1.00 Mar. 12, 2008 Page 1071 of 1178
REJ09B0403-0100
28.6
Hardware Standby Mode
The CPU makes a transition to hardware standby mode from any mode when the
STBY
pin is
driven low.
In hardware standby mode, all functions enter the reset state. As long as the prescribed voltage is
supplied, on-chip RAM data is retained. The I/O ports are set to the high-impedance state.
In order to retain on-chip RAM data, the RAME bit in SYSCR should be cleared to 0 before
driving the
STBY
pin low. Do not change the state of the mode pins (
MD2
and MD1) while this
LSI is in hardware standby mode.
Hardware standby mode is cleared by the
STBY
pin input or the
RES
pin input.
When the
STBY
pin is driven high while the
RES
pin is low, clock oscillation is started. Ensure
that the
RES
pin is held low until system clock oscillation settles. When the
RES
pin is
subsequently driven high after the clock oscillation settling time has passed, reset exception
handling starts.
Figure 28.4 shows an example of hardware standby mode timing.
Oscillator
RES
STBY
Oscillation
stabilization
time
Reset
exception
handling
Figure 28.4 Hardware Standby Mode Timing
Содержание H8S Family
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