R8C2K datasheet(231/471 Pages) RENESAS

231 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 214 of 450

REJ09B0406-0110

16.3.8

Timer RC Interrupt

Timer RC generates a timer RC interrupt request from five sources. The timer RC interrupt uses the single

TRCIC register (bits IR and ILVL0 to ILVL2) and a single vector.

Table 16.24 lists the Registers Associated with Timer RC Interrupt, and Figure 16.62 is a Timer RC Interrupt

Block Diagram.

Figure 16.62

Timer RC Interrupt Block Diagram

Like other maskable interrupts, the timer RC interrupt is controlled by the combination of the I flag, IR bit, bits

ILVL0 to ILVL2, and IPL. However, it differs from other maskable interrupts in the following respects because

a single interrupt source (timer RC interrupt) is generated from multiple interrupt request sources.

• The IR bit in the TRCIC register is set to 1 (interrupt requested) when a bit in the TRCSR register is set to

1 and the corresponding bit in the TRCIER register is also set to 1 (interrupt enabled).

• The IR bit is set to 0 (no interrupt request) when the bit in the TRCSR register or the corresponding bit in

the TRCIER register is set to 0, or both are set to 0. In other words, the interrupt request is not maintained

if the IR bit is once set to 1 but the interrupt is not acknowledged.

• If after the IR bit is set to 1 another interrupt source is triggered, the IR bit remains set to 1 and does not

change.

• If multiple bits in the TRCIER register are set to 1, use the TRCSR register to determine the source of the

interrupt request.

• The bits in the TRCSR register are not automatically set to 0 when an interrupt is acknowledged. Set them

to 0 within the interrupt routine. Refer to Figure 16.32 TRCSR Register, for the procedure for setting

these bits to 0.

Refer to Figure 16.31 TRCIER Register, for details of the TRCIER register.

Refer to 12.1.6 Interrupt Control, for details of the TRCIC register and 12.1.5.2 Relocatable Vector Tables,

for information on interrupt vectors.

Table 16.24

Registers Associated with Timer RC Interrupt

Timer RC Status Register

Timer RC Interrupt Enable Register

Timer RC Interrupt Control Register

TRCSR

TRCIER

TRCIC

Timer RC interrupt request

(IR bit in TRCIC register)

IMFA bit

IMIEA bit

IMFB bit

IMIEB bit

IMFC bit

IMIEC bit

IMFD bit

IMIED bit

OVF bit

OVIE bit

IMFA, IMFB, IMFC, IMFD, OVF: Bits in TRCSR register

IMIEA, IMIEB, IMIEC, IMIED, OVIE: Bits in TRCIER register

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