HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 401

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

13.2.4
STBCR4 is an 8-bit readable/writable register that controls the operation of modules in the power-
down mode. STBCR4 is initialized at power-on reset but retains the previous value after manual
reset.
Bit
7
6
5, 4
3
2
Standby Control Register 4 (STBCR4)
Bit Name

MSTP46

MSTP43
MSTP42
Initial Value R/W
0
0
All 0
0
0
R
R/W
R
R/W
R/W
Description
Reserved
This bit is always read as 0. The write value should
always be 0. If 1 is written to these bits, correct
operation cannot be guaranteed.
Module Stop 46
When the MSTP46 bit is set to 1, the supply of the
clock to the USB is halted.
0: USB runs
1: Clock supply to USB halted
Note: If this bit is set to 1, it can only be cleared by
Reserved
This bit is always read as 0. The write value should
always be 0. If 1 is written to these bits, correct
operation cannot be guaranteed.
Module Stop 43
When the MSTP43 bit is set to 1, the supply of the
clock to the BOOT is halted.
0: BOOT runs
1: Clock supply to BOOT halted
Note: When this bit is changed from 1 to 0 (when the
supply to the BOOT was in a halted state and then
changed to a run state), it takes time until access to
the BOOT module is possible. When this bit is
changed from 1 to 0, accessing the BOOT module
should be made after the STBCR4 register is read to
secure a time for warm up.
Module Stop 42
When the MSTP42 bit is set to 1, the supply of the
clock to the DAC is halted.
0: DAC runs
1: Clock supply to DAC halted
a power-on reset. Even if 0 is written to this
bit, it cannot be cleared to 0.
Rev. 1.00, 02/04, page 363 of 804