M16C28 Datasheet, PDF (171/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
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. 2.00 Jan. 31, 2007 ^{page 151} of 385
REJ09B0047-0200