HD64F3039F18 Datasheet, PDF (674/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Appendix B Internal I/O Register Field
SYSCR—System Control Register
H'F2
System control
Bit
7
6
5
4
3
2
1
0
SSBY STS2 STS1 STS0 UE NMIEG — RAME
Initial value
0
0
0
0
1
0
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
—
R/W
RAM enable
0 On-chip RAM is disabled
1 On-chip RAM is enabled
NMI edge select
0 An interrupt is requested at the falling edge of NMI
1 An interrupt is requested at the rising edge of NMI
User bit enable
0 CCR bit 6 (UI) is used as an interrupt mask bit
1 CCR bit 6 (UI) is used as a user bit
Standby timer select 2 to 0
Bit 6 Bit 5 Bit 4
STS2 STS1 STS0
Standby Timer
0
0
0 Waiting time = 8192 states
1 Waiting time = 16384 states
1
0 Waiting time = 32768 states
1 Waiting time = 65536 states
1
0
— Waiting time = 131072 states
1 — Illegal setting
Software standby
0 SLEEP instruction causes transition to sleep mode
1 SLEEP instruction causes transition to software standby mode
Rev.3.00 Mar. 26, 2007 Page 650 of 682
REJ09B0353-0300