HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 406

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

WTCNT value
H'FF
H'80
13.3.3
1. Transition to Module Standby Function
2. Canceling Module Standby Function
Rev. 1.00, 02/04, page 368 of 804
 Canceling with a Reset
Setting the standby control register MSTP bits to 1 halts the supply of clocks to the
corresponding on-chip peripheral modules. This function can be used to reduce the power
consumption in normal mode as well as sleep mode. The module should be disabled before a
transition to the module standby function is made.
In module standby state, the functions of the external pins of the on-chip peripheral modules
change depending on the on-chip peripheral module and port settings. Almost all of the
register states are the same as those in standby mode. For details, refer to table 13.3.
The module standby function can be canceled by clearing the MSTP bits to 0, or by a power-
on reset. To cancel the module standby function by clearing the corresponding MSTP bit to 0,
read the MSTP bit to check the MSTP bit was cleared correctly.
Software standby mode is canceled by a reset using the RESETP pin. Keep the RESETP
pin low until the clock oscillation settles. The internal clock will continue to be output to
the CKIO pin except clock operating mode 7.
Module Standby Function
Figure 13.1 Canceling Standby Mode with STBCR.STBY
Interrupt
request
Crystal oscillator settling
time and PLL synchronization
time
WDT overflow and branch to
interrupt handling routine
Clear bit STBCR.STBY before
WTCNT reaches H'80. When
STBCR. STBY is cleared, WTCNT
halts automatically.
Time