D12320VF25IV Datasheet, PDF (1165/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Appendix B Internal I/O Registers
SYSCR—System Control Register
H'FF39
MCU
Bit
:
7
—
Initial value :
0
Read/Write : R/W
6
5
4
3
2
1
0
— INTM1 INTM0 NMIEG LWROD IRQPAS RAME
0
0
0
0
0
0
1
—
R/W R/W R/W R/W R/W R/W
RAM Enable
0 On-chip RAM disabled
1 On-chip RAM enabled
IRQ Port Switching Select
0 IRQ₄ to IRQ₇ can be input
from PA₄ to PA₇
1 IRQ₄ to IRQ₇ can be input
from P5₀ to P5₃
Note: IRQ₄ to IRQ₇ input is always
performed from only one of
the ports.
LWR Output Disable
0 PF₃ is designated as LWR output pin
1 PF₃ is designated as I/O port, and
does not function as LWR output pin
NMI Input Edge Select
0 Falling edge
1 Rising edge
Interrupt Control Mode Selection
0 0 Interrupt control mode 0
1 Setting prohibited
1 0 Interrupt control mode 2
1 Setting prohibited
Reserved
Only 0 should be written to this bit
Rev.6.00 Sep. 27, 2007 Page 1133 of 1268
REJ09B0220-0600