HD6417750RF240V Datasheet, PDF (529/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 20 Power-Down Modes
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 Controller Area Network (HCAN)
2
MSTPC2
1
1
MSTPC1^*
1
0
MSTPC0^*
1
R/W Motor Management Timer (MMT)
R/W
R/W
Note: * MSTPA7 is a readable/writable bit with an initial value of 0 and should always be written
with 0.
MSTPA4, MSTPA2, MSTPA0, MSTPB4 to MSTPB0, MSTPC7 to MSTPC5, MSTPC1,
and MSTPC0 are readable/writable bits with an initial value of 1 and should always be
written with 1.
20.2 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 supporting 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.
Rev. 7.00 Sep. 11, 2009 Page 493 of 566
REJ09B0211-0700