Datasheet

Section 3 MCU Operating Modes
Rev.7.00 Feb. 14, 2007 page 75 of 1108
REJ09B0089-0700
Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the input levels at pins
MD2 to MD0 (the current operating mode). Bits MDS2 to MDS0 correspond to pins MD2 to
MD0. MDS2 to MDS0 are read-only bits, and cannot be written to. The mode pin (MD2 to MD0)
input levels are latched into these bits when MDCR is read. These latches are canceled by a reset.
3.2.2 System Control Register (SYSCR)
Bit : 7 6 5 4 3 2 1 0
— — INTM1 INTM0 NMIEG LWROD — RAME
Initial value : 0 0 0 0 0 0 0 1
R/W : R/W — R/W R/W R/W R/W R/W R/W
Bit 7—Reserved: Only 0 should be written to this bit.
Bit 6—Reserved: This bit is always read as 0, and cannot be modified.
Bits 5 and 4—Interrupt Control Mode 1 and 0 (INTM1, INTM0): These bits select the control
mode of the interrupt controller. For details of the interrupt control modes, see section 5.4.1,
Interrupt Control Modes and Interrupt Operation.
Bit 5
INTM1
Bit 4
INTM0
Interrupt Control
Mode Description
0 0 0 Control of interrupts by I bit (Initial value)
1 — Setting prohibited
1 0 2 Control of interrupts by I2 to I0 bits and IPR
1 — Setting prohibited
Bit 3—NMI Edge Select (NMIEG): Selects the valid edge of the NMI interrupt input.
Bit 3
NMIEG Description
0 An interrupt is requested at the falling edge of NMI input (Initial value)
1 An interrupt is requested at the rising edge of NMI input