Instructions For Disabling Interrupts; Interrupts During Execution Of Eepmov Instruction; Vector Address Switching - Renesas H8S/2100 Series Hardware Manual

Section 5 Interrupt Controller
5.8.2

Instructions for Disabling Interrupts

The instructions that disable interrupts are LDC, ANDC, ORC, and XORC. After any of these
instructions are executed, all interrupts including NMI are disabled and the next instruction is
always executed. When the I bit or UI bit is set by one of these instructions, the new value
becomes valid two states after execution of the instruction ends.
5.8.3

Interrupts during Execution of EEPMOV Instruction

Interrupt operation differs between the EEPMOV.B instruction and the EEPMOV.W instruction.
With the EEPMOV.B instruction, an interrupt request including NMI issued during data transfer is
not accepted until data transfer is completed.
With the EEPMOV.W instruction, if an interrupt request is issued during data transfer, interrupt
exception handling starts at a break in the transfer cycles. The PC value saved on the stack in this
case is the address of the next instruction. Therefore, if an interrupt is generated during execution
of an EEPMOV.W instruction, the following coding should be used.
L1: EEPMOV.W
MOV.W
BNE
5.8.4

Vector Address Switching

Switching between H8S/2140B Group compatible vector mode and extended vector mode must be
done in a state with no interrupts occurring.
If the EIVS bit in SYSCR3 is changed from 0 to 1 when interrupt input is enabled because the
KIN15 to KIN0 and WUE15 to WUE8 pins are set at low level, a falling edge is detected, thus
causing an interrupt to be generated. The vector mode must be changed when interrupt input is
disabled, that is the KIN15 to KIN0 and WUE15 to WUE8 pins are set at high level.
Rev. 1.00 Apr. 28, 2008 Page 130 of 994
REJ09B0452-0100
R4,R4
L1