h8s-2628 Renesas Electronics Corporation., h8s-2628 Datasheet - Page 547

• Manufacturer Part Number: h8s-2628
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Note:
21.2
When the SCK2 to SCK0 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 ( /2, /4, /8, /16, or /32) specified by the SCK2 to SCK0 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 ( ).
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 /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 SCK2 to SCK0 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.
Bit
7
6
5
4
3
2
1
0
MSTPCRC
Bit Name
MSTPC7 *
MSTPC6 *
MSTPC5 *
MSTPC4
MSTPC3
MSTPC2
MSTPC1 *
MSTPC0 *
*
Medium-Speed Mode
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.
Initial Value
1
1
1
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Module
PC break controller (PBC)
Controller area network (HCAN)
Synchronous serial communication unit (SSU)
Rev. 3.00 Oct 04, 2005 page 507 of 598
Section 21 Power-Down Modes
REJ09B0155-0300