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MSTPCRC
Bit
Bit Name
Initial Value
R/W
Module
7 MSTPC7
*
1
R/W
6 MSTPC6
*
1
R/W
5 MSTPC5
*
1
R/W
4
MSTPC4
1
R/W
PC break controller (PBC)
3
MSTPC3
1
R/W
Hitachi Controller Area Network (HCAN)
2
MSTPC2
1
R/W
Synchronous serial communication unit (SSU)
1 MSTPC1
*
1
R/W
0 MSTPC0
*
1
R/W
Note:
*
MSTPA7 is a readable/writable bit with an initial value of 0. The write value should always
be 0.
MSTPA2, MSTPB6, MSTPB4 to MSTPB0, MSTPC7 to MSTPC5, MSTPC1, and MSTPC0
are readable/writable bits with an initial value of 1. The write value should always be 1.
21.2 Medium-Speed
Mode
When the SCK0 to SCK2 bits in SCKCR are set to 1, the operating mode changes to medium-
speed mode as soon as the current bus cycle ends. In medium-speed mode, the CPU operates on
the operating clock (
φ
/2,
φ
/4,
φ
/8,
φ
/16, or
φ
/32) specified by the SCK0 to SCK2 bits. Bus masters
(DTC) other than the CPU also operate in medium-speed mode. On-chip peripheral modules other
than bus masters always operate on the high-speed clock (
φ
).
In medium-speed mode, a bus access is executed in the specified number of states with respect to
the bus master operating clock. For example, if
φ
/4 is selected as the operating clock, on-chip
memory is accessed in 4 states, and internal I/O registers in 8 states.
Medium-speed mode is cleared by clearing all of bits SCK0 to SCK2 to 0. A transition is made to
high-speed mode and medium-speed mode is cleared at the end of the current bus cycle.
If a SLEEP instruction is executed when the SSBY bit in SBYCR is cleared to 0, a transition is
made to sleep mode. When sleep mode is cleared by an interrupt, medium-speed mode is restored.
When the SLEEP instruction is executed with the SSBY bit = 1, operation shifts to the software
standby mode. When software standby mode is cleared by an external interrupt, medium-speed
mode is restored.
When the
RES
pin is set low and medium-speed mode is cancelled, operation shifts to the reset
state. The same applies in the case of a reset caused by overflow of the watchdog timer.
When the
STBY
pin is driven low, a transition is made to hardware standby mode.
Содержание H8S/2627
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