HD64F3644PV Datasheet, PDF (505/551 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

SYSCR2—System control register 2
Appendix B Internal I/O Registers
H'FFF1
System control
Bit
7
6
5
4
3
2
1
0
—
—
— NESEL DTON MSON SA1 SA0
Initial value
1
1
1
0
0
0
0
0
Read/Write
—
—
—
R/W
R/W
R/W
R/W
R/W
Subactive mode clock select
Medium speed on flag
0 0 φ _W/8
1 φ _W/4
1 _* φ _W/2
* Don’t care
0 • Operates in active (high-speed) mode after exit from standby, watch, or sleep
mode
• Operates in sleep (high-speed) mode if a SLEEP instruction is executed in
active mode
1 • Operates in active (medium-speed) mode after exit from standby, watch,
or sleep mode
• Operates in sleep (medium-speed) mode if a SLEEP instruction is executed
in active mode
Direct transfer on flag
0 • When a SLEEP instruction is executed in active mode, a transition is
made to standby mode, watch mode, or sleep mode
• When a SLEEP instruction is executed in subactive mode, a transition is
made to watch mode or subsleep mode
1 • When a SLEEP instruction is executed in active (high-speed) mode, a direct
transition is made to active (medium-speed) mode if SSBY = 0, MSON = 1, and
LSON = 0, or to subactive mode if SSBY = 1, TMA3 = 1, and LSON = 1
• When a SLEEP instruction is executed in active (medium-speed) mode, a direct
transition is made to active (high-speed) mode if SSBY = 0, MSON = 0, and
LSON = 0, or to subactive mode if SSBY = 1, TMA3 = 1, and LSON = 1
• When a SLEEP instruction is executed in subactive mode, a direct
transition is made to active (high-speed) mode if SSBY = 1, TMA3 = 1, LSON = 0,
and MSON = 0, or to active (medium-speed) mode if SSBY = 1, TMA3 = 1,
LSON = 0, and MSON = 1
Noise elimination sampling frequency select
0 Sampling rate is φ_OSC/16
1 Sampling rate is φ_OSC/4
Rev. 6.00 Sep 12, 2006 page 483 of 526
REJ09B0326-0600