HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 955
HD6412320
Manufacturer Part Number
HD6412320
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412320.pdf
(1302 pages)
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21.2.3
MSTPCR is a 16-bit readable/writable register that performs module stop mode control.
MSTPCR is initialized to H'3FFF by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bits 15 to 0—Module Stop (MSTP15 to MSTP0): These bits specify module stop mode. See
table 21.3 for the method of selecting on-chip supporting modules.
Bits 15 to 0
MSTP15 to MSTP0
0
1
21.3
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 (φ/2, φ/4, φ/8, φ/16, or φ/32) specified by the SCK2 to SCK0 bits. The bus
masters other than the CPU (the DMAC * and DTC) also operate in medium-speed mode. On-chip
supporting modules other than the 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 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.
Bit
Initial value :
R/W
Module Stop Control Register (MSTPCR)
Medium-Speed Mode
:
: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
15
0
14
0
Description
Module stop mode cleared
Module stop mode set
13
1
MSTPCRH
12
1
11
1
10
1
9
1
8
1
Rev.6.00 Sep. 27, 2007 Page 925 of 1268
7
1
6
1
Section 21 Power-Down Modes
5
1
MSTPCRL
4
1
REJ09B0220-0600
3
1
2
1
1
1
0
1
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