HD6437101 RENESAS [Renesas Technology Corp], HD6437101 Datasheet - Page 487

• Manufacturer Part Number: HD6437101
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

18.2.1
SBYCR is an 8-bit readable/writable register that performs software standby mode control.
Bit
7
6
5
4 to 1 ⎯
0
Bit Name
SSBY
HIZ
⎯
IRQEL
Standby Control Register (SBYCR)
Initial
Value
0
0
0
All 1
1
R/W
R/W
R
R
R/W
R/W
Description
Specifies the transition mode after executing the SLEEP
instruction.
0: Transition to sleep mode after the SLEEP instruction
1: Transition to software standby mode after the SLEEP
This bit cannot be set to 1 when the watchdog timer
(WDT) is operating (when the TME bit in TCSR of the
WDT is set to 1). When entering software standby mode,
clear the TME bit to 0, stop the WDT, then set the SSBY
bit to 1.
Port High-Impedance
In software standby mode, this bit selects whether the pin
state of the I/O port is retained or changed to high-
impedance.
0: In software standby mode, the pin state is retained.
1: In software standby mode, the pin state is changed to
The HIZ bit cannot be set to 1 when the TEM bit in TCSR
of the WDT is set to 1.
When changing the pin state of the I/O port to high-
impedance, clear the TEM bit to 0, then set the HIZ bit to
1.
Reserved
This bit is always read as 0. The write value should always
be 0.
Reserved
These bits are always read as 1. The write value should
always be 1.
IRQ3 to IRQ0 Enable
Enables to clear software standby mode by IRQ interrupts.
0: Software standby mode is cleared.
1: Software standby mode is not cleared.
Software Standby
has been executed
instruction has been executed
high-impedance.
Rev.1.00 Sep. 18, 2008 Page 453 of 522
Section 18 Power-Down Modes
REJ09B0069-0100