R8C32A Datasheet, PDF (159/603 Pages) Renesas Technology Corp – MCU M16C FAMILY / R8C/Tiny SERIES

Under development ^{Preliminary specification}
Specifications in this manual are tentative and subject to change.
R8C/32A Group
11. Interrupts
11.3.5 Interrupt Response Time
Figure 11.4 shows the Interrupt Response Time. The interrupt response time is the period from when an
interrupt request is generated until the first instruction in the interrupt routine is executed. The interrupt
response time includes the period from when an interrupt request is generated until the currently executing
instruction is completed (refer to (a) in Figure 11.4) and the period required for executing the interrupt sequence
(20 cycles, refer to (b) in Figure 11.4).
Interrupt request generation Interrupt request acknowledgement
Instruction
(a)
Interrupt sequence
20 cycles (b)
Interrupt response time
Time
Instruction in
interrupt routine
(a) The period from when an interrupt request is generated until the currently executing instruction is completed.
The length of time varies depending on the instruction being executed. The DIVX instruction requires
the longest time, 30 cycles (no wait states if the divisor is a register).
(b) 21 cycles for address match and single-step interrupts.
Figure 11.4 Interrupt Response Time
11.3.6 IPL Change when Interrupt Request is Acknowledged
When a maskable interrupt request is acknowledged, the interrupt priority level of the acknowledged interrupt
is set in the IPL.
When a software interrupt or special interrupt request is acknowledged, the level listed in Table 11.5 is set in
the IPL.
Table 11.5 lists the IPL Value When Software or Special Interrupt is Acknowledged.
Table 11.5 IPL Value When Software or Special Interrupt is Acknowledged
Interrupt Source without Interrupt Priority Level
Watchdog timer, oscillation stop detection, voltage monitor 1/comparator A1,
voltage monitor 2/comparator A2, address break
Software, address match, single-step
Value Set in IPL
7
Not changed
REJ09B0458-0010 Rev.0.10 Apr 01, 2008
Page 131 of 572