HD6432621 Hitachi, HD6432621 Datasheet - Page 734

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

21A.1.1 Register Configuration
Power-down modes are controlled by the SBYCR, SCKCR, LPWRCR, and MSTPCR registers.
Table 21A-2 summarizes these registers.
Table 21A-2 Power-Down Mode Registers
Name
Standby control register
System clock control register
Low power control register
Module stop control register
A, B, C
Note: * Lower 16 bits of the address.
21A.2 Register Descriptions
21A.2.1 Standby Control Register (SBYCR)
SBYCR is an 8-bit readable/writable register that performs power-down mode control.
SBYCR is initialized to H'08 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 7—Software Standby (SSBY): When making a low power dissipation mode transition by
executing the SLEEP instruction, the operating mode is determined in combination with other
control bits.
Note that the value of the SSBY bit does not change even when shifting between modes using
interrupts.
690
Bit
Initial value :
R/W
:
:
SSBY
R/W
7
0
STS2
R/W
6
0
Abbreviation
SBYCR
SCKCR
LPWRCR
MSTPCRA
MSTPCRB
MSTPCRC
STS1
R/W
5
0
STS0
R/W
4
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
OPE
R/W
3
1
Initial Value
H'08
H'00
H'00
H'3F
H'FF
H'FF
—
—
2
0
—
—
1
0
Address*
H'FDE4
H'FDE6
H'FDEC
H'FDE8
H'FDE9
H'FDEA
—
—
0
0