Rev. 3.0, 10/02, page 620 of 686
2. To retain RAM contents with the RAME bit cleared to 0 in SYSCR, or when RAM contents do
not need to be retained
RES
does not have to be driven low as in the above case.
Timing of Recovery from Hardware Standby Mode
Drive the
RES
signal low approximately 100 ns or more before
STBY
goes high to execute a
power-on reset.
t
OSC
t
NMIRH
t
≥
100ns
Figure 22.6 Timing of Recovery from Hardware Standby Mode
22.6
Module Stop Mode
Module stop mode can be set for individual on-chip supporting modules.
When the corresponding MSTP bit in MSTPCR is set to 1, module operation stops at the end of
the bus cycle and a transition is made to module stop mode. The CPU continues operating
independently.
When the corresponding MSTP bit is cleared to 0, module stop mode is cleared and the module
starts operating at the end of the bus cycle. In module stop mode, the internal states of modules
other than the A/D converter are retained.
After reset clearance, all modules other than DTC and DMAC are in module stop mode.
When an on-chip supporting module is in module stop mode, read/write access to its registers is
disabled.
When a transition is made to sleep mode with all modules stopped, the bus controller and I/O ports
also stop operating, enabling current dissipation to be further reduced.
22.7
ø Clock Output Disabling Function
Output of the ø clock can be controlled by means of the PSTOP bit in SCKCR, and DDR for the
corresponding port. When the PSTOP bit is set to 1, the ø clock stops at the end of the bus cycle,
and ø output goes high. ø clock output is enabled when the PSTOP bit is cleared to 0. When DDR
Содержание H8S/2215 Series
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