M16C29 Datasheet, PDF (180/499 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/Tiny SERIES

M16C/29 Group
13. Timer S
13.2 Interrupt Operation
The IC/OC interrupt contains several request causes. Figure 13.18 shows the IC/OC interrupt block dia-
gram and Table 13.4 shows the IC/OC interrupt assignation.
When either the base timer reset request or base timer overflow request is generated, the IR bit in the BTIC
register corresponding to the IC/OC base timer interrupt is set to 1 (with an interrupt request). Also when an
interrupt request in each eight channels (channel i) is generated, the bit i in the G1IR register is set to 1 (with
an interrupt request). At this time, if the bit i in the G1IE0 register is 1 (IC/OC interrupt 0 request enabled),
the IR bit in the ICOC0IC register corresponding to the IC/OC interrupt 0 is set to 1 (with an interrupt
request). And if the bit i in the G1IE1 register is 1 (IC/OC interrupt 1 request enabled), the IR bit in the
ICOC1IC register corresponding to the IC/OC interrupt 1 is set to 1(with an interrupt request).
Additionally, because each bit in the G1IR register is not automatically set to 0 even if the interrupt is
acknowledged, set to 0 by program. If these bits are left as 1, all IC/OC channel interrupt causes, which are
generated after setting the IR bit to 1, will be disabled.
Interrupt Select Logic
Channel 0 to 7 Interrupt requests
All register are read / write
G1IE0
ENABLE
Base timer reset request
Base timer overflow request
DMA Requests (channel 0 to 7)
G1IR
REQUEST
G1IE1
ENABLE
IC/OC interrupt 1 request
IC/OC interrupt 0 request
IC/OC base timer interrupt request
Base Timer Interrupt / DMA Request
Figure 13.18 IC/OC Interrupt and DMA request generation
Table 13.4 Interrupt Assignment
Interrupt
IC/OC base timer interrupt
IC/OC interrupt 0
IC/OC interrupt 1
Interrupt control register
BTIC(004716)
ICOC0IC(004516)
ICOC0IC(004616)
13.3 DMA Support
Each of the interrupt sources - the eight IC/OC channel interrupts and the one Base Timer interrupt - are
capable of generating a DMA request.
Rev. 1.12 Mar.30, 2007 ^{page 156} of 458
REJ09B0101-0112