HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 773

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

20.2.2
Standby control register 2 (SBYCR2) is an 8-bit read/write register that sets the power-down mode
state. SBYCR2 is initialized to H'00 by a reset.
Bits 7 and 6—Reserved: These bits are always read as 0. The write value should always be 0.
Bit 5—Module Stop 11 (MSTP11): Specifies halting the clock supply to the 16-bit timer pulse
unit (TPU). When the MSTP11 bit is set to 1, the supply of the clock to the TPU is halted. When
the clock halts, the TPU retains its pre-halt state, and the TPU interrupt vector register in the INTC
retains its pre-halt value. Therefore, when MSTP11 is cleared to 0 and the clock supply to the TPU
is resumed, the TPU starts operating again.
Bit 5: MSTP11
0
1
Bit 4—Module Stop 10 (MSTP10): Specifies halting the clock supply to SIO channel 2. When the
MSTP10 bit is set to 1, the supply of the clock to SIO channel 2 is halted. When the clock halts,
SIO channel 2 retains its pre-halt state, and the SIO channel 2 interrupt vector register in the INTC
retains its pre-halt value. Therefore, when MSTP10 is cleared to 0 and the clock supply to SIO
channel 2 is restarted, operation starts again.
Bit 4: MSTP10
0
1
Initial value:
Standby Control Register 2 (SBYCR2)
R/W:
Bit:
Description
TPU running
Clock supply to TPU halted
Description
SIO channel 2 running
Clock supply to SIO channel 2 halted
—
7
0
R
—
6
0
R
MSTP11
(TPU)
R/W
5
0
MSTP10
(SIO2)
R/W
4
0
MSTP9
(SIO1)
R/W
3
0
MSTP8
(SIO0)
R/W
2
0
(SCIF2)
MSTP7
R/W
1
0
(Initial value)
(Initial value)
(SCIF1)
MSTP6
R/W
0
0
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