HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 505

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

18.2.2
MSTCRH is an 8-bit readable/writable register that controls output of the system clock (φ). It also
controls the module standby function, which places individual on-chip supporting modules in the
standby state. Module standby can be designated for the SCI0, SCI1.
MSTCRH is initialized to H'78 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 7—φ Clock Stop (PSTOP): Enables or disables output of the system clock (φ).
Bit 7
PSTOP
0
1
Bits 6 to 3—Reserved: These bits cannot be modified and are always read as 1.
Bit 2—Reserved: This bit can be written and read.
Bit 1—Module Standby H1 (MSTPH1): Selects whether to place the SCI1 in standby.
Bit 1
MSTPH1
0
1
Bit
Initial value
Read/Write
Module Standby Control Register H (MSTCRH)
Description
System clock output is enabled
System clock output is disabled
Description
SCI1 operates normally
SCI1 is in standby state
PSTOP
φ clock stop
Enables or disables
output of the system clock
R/W
7
0
⎯
⎯
6
1
⎯
⎯
5
1
Reserved bits
⎯
⎯
4
1
Rev.4.00 Aug. 20, 2007 Page 461 of 638
⎯
⎯
3
1
R/W
Module standby H1 to H0
These bits select modules
to be placed in standby
⎯
2
0
18. Power-Down State
MSTPH1
R/W
REJ09B0395-0400
1
0
(Initial value)
(Initial value)
MSTPH0
R/W
0
0