M16CSLASH1N datasheet(75/238 Pages) RENESAS

75 / 238 page

Rev.1.00

Oct 20, 2004

page 63 of 222

M16C/1N Group

10. Interrupt

REJ09B0007-0100Z

10.4 TCIN Interrupt

A TCIN interrupt is generated from edges of a TCIN input signal or after 256 divisions of fRING.

To use TCIN input signal, set the time measurement input source switching bit (bit 7 at address 009A16)

of timer C control register 0 to "0" (TCIN). The level of input to TCIN pin is sampled by one of three

sampling clocks, f1, f8 or f32, selected with the digital filter clock select bit (bits 0 and 1 at address

009B16). The input level is determined when the sampled input level matches three times. (However, if

the port P33 is read, the value will be the unfiltered value.) The edge polarity of an interrupt can be a rising

edge, a falling edge, or both edges using the time measurement edge trigger select bits (bits 3 and 4 at

address 009A16).

When triggered after 256 divisions of fRING, set the time measurement input source switching bit (bit 7 at

address 009A16) to "1" (fRING256).

Figure 10.13 shows the timer C control registers 0 and 1.

Figure 10.13 Timer C control registers 0 and 1

Note 1: Change this bit when time measurement is disabled.

Note 2: Set the ring oscillation stop bit (CM14) to "0" before setting this bit to "1".

Note 3: Inhibit an interrupt when changing the time measurement input source switching bit. The TCIN interrupt may be

generated after changing the time measurement input source switching bit. An interrupt should be enabled after

the interrupt request bit is cleared.

b5 b4

Timer C control register 0

TCC00

Time measurement control bit

0 : Time measurement disabled

1 : Time measurement enabled

TCC07

Time measurement input

source switching bit

(Note 1 to 3)

0 : TCIN

1 : fRING256

TCC01

Timer C clock select bit

(Note 1)

TCC02

Symbol

TCC0

Address

009A16

When reset

0XX000002

Function

Bit name

Bit symbol

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : Inhibited

b2 b1

TCC03

Nothing is assigned.

When write, set "0". When read, their contents are "0".

Nothing is assigned.

When write, set "0". When read, their contents are "0".

b5 b4

Timer C control register 1

TCC10

Digital filter clock select bit

(Note 1)

TCC11

Symbol

TCC1

Address

009B16

When reset

XXXXXX112

Function

Bit name

Bit symbol

0 0 : Inhibited

0 1 : f1

1 0 : f8

1 1 : f32

b1 b0

Time measurement input edge

trigger bit

(Note 1)

TCC04

0 0 : Rising edge

0 1 : Falling edge

1 0 : Both edges

1 1 : Inhibited

b4 b3

Note 1: Input edge becomes active when the same value from TCIN pin is sampled three times in succession.

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