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RL78/G1A CHAPTER 16 INTERRUPT FUNCTIONS
Table 16-5. Relationship Between Interrupt Requests Enabled for Multiple Interrupt Servicing
During Interrupt Servicing
Maskable Interrupt Request
Priority Level 0
(PR = 00)
Priority Level 1
(PR = 01)
Priority Level 2
(PR = 10)
Priority Level 3
(PR = 11)
Multiple Interrupt Request
Interrupt Being Serviced
IE = 1 IE = 0 IE = 1 IE = 0 IE = 1 IE = 0 IE = 1 IE = 0
Software
Interrupt
Request
ISP1 = 0
ISP0 = 0
{
× × × × × × ×
{
ISP1 = 0
ISP0 = 1
{
×
{
× × × × ×
{
ISP1 = 1
ISP0 = 0
{
×
{
×
{
× × ×
{
Maskable interrupt
ISP1 = 1
ISP0 = 1
{ { { { { { { { {
Software interrupt
{
×
{
×
{
×
{
×
{
<R>
Remarks 1. {: Multiple interrupt servicing enabled
2. ×: Multiple interrupt servicing disabled
3. ISP0, ISP1, and IE are flags contained in the PSW.
ISP1 = 0, ISP0 = 0: An interrupt of level 1 or level 0 is being serviced.
ISP1 = 0, ISP0 = 1: An interrupt of level 2 is being serviced.
ISP1 = 1, ISP0 = 0: An interrupt of level 3 is being serviced.
ISP1 = 1, ISP0 = 1: Wait for An interrupt acknowledgment (all interrupts are enabled).
<R>
IE = 0: Interrupt request acknowledgment is disabled.
IE = 1: Interrupt request acknowledgment is enabled.
4. PR is a flag contained in the PR00L, PR00H, PR01L, PR01H, PR02L, PR02H, PR10L, PR10H, PR11L,
PR11H, PR12L, and PR12H registers.
PR = 00: Specify level 0 with ××PR1× = 0, ××PR0× = 0 (higher priority level)
PR = 01: Specify level 1 with ××PR1× = 0, ××PR0× = 1
PR = 10: Specify level 2 with ××PR1× = 1, ××PR0× = 0
PR = 11: Specify level 3 with ××PR1× = 1, ××PR0× = 1 (lower priority level)
R01UH0305EJ0200 Rev.2.00 710
Jul 04, 2013