H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 729

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

20.6.2
Software standby mode is cleared by an external interrupt (NMI pin, or pins IRQ0 to IRQ2), or by
means of the RES pin or STBY pin.
Clearing with an Interrupt
When an NMI or IRQ0 to IRQ2 interrupt request signal is input, clock oscillation starts, and after
the elapse of the time set in bits STS2 to STS0 in SYSCR, stable clocks are supplied to the entire
H8S/2350 Group chip, software standby mode is cleared, and interrupt exception handling is
started.
When clearing software standby mode with an IRQ0 to IRQ2 interrupt, set the corresponding
enable bit to 1 and ensure that no interrupt with a higher priority than interrupts IRQ0 to IRQ2 is
generated. Software standby mode cannot be cleared if the interrupt has been masked on the CPU
side or has been designated as a DTC activation source.
Clearing with the RES
When the RES pin is driven low, clock oscillation is started. At the same time as clock oscillation
starts, clocks are supplied to the entire H8S/2350 Group chip. Note that the RES pin must be held
low until clock oscillation stabilizes. When the RES pin goes high, the CPU begins reset exception
handling.
Clearing with the STBY
When the STBY pin is driven low, a transition is made to hardware standby mode.
Clearing Software Standby Mode
RES Pin
RES
STBY
STBY Pin
RES
STBY
Rev. 3.00 Sep 15, 2006 page 695 of 988
Section 20 Power-Down Modes
REJ09B0330-0300