M16CSLASH1N datasheet(117/238 Pages) RENESAS

117 / 238 page

Rev.1.00

Oct 20, 2004

page 105 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

Time measurement register (16)

Upper 8 bits

Lower 8 bits

Timer C counter (16)

f32

Edge detection

TCIN

1/256

On-chip oscillation

TCIN interrupt

Timer C overflow interrupt

Time measurement

input source

switching bit

"0"

"1"

Timer C clock

select bit

Reload signal

Digital

filter

f32

Digital filter clock

select bit

Address 009D16

Address 009C16

Address 009016

Address 009116

Data bus

Upper 8 bits

Lower 8 bits

12.5 Timer C

Timer C is a 16-bit free-running timer. The Timer C uses an edge input to TCIN pin or the output of 256

fRING divisions as trigger to latch the timer count value and generates an interrupt request. The TCIN

input has a digital filter and this prevents an error caused by noise or so on from occurring.

Figure 12.31 shows the block diagram of Timer C. Table 12.14 shows Timer C specifications. Figure

12.32 shows Timer C-related registers. Figure 12.33 shows an operation example of Timer C and timer

measurement register.

Figure 12.31 Block diagram of Timer C

Table 12.14 Specifications of Timer C

Item

Specification

Count source

f1, f8, f32

Count operation

• Up count

• Transfer counter value to time measurement register at active edge of

measurement pulse

• When timer C stops counting, the value of timer C is reset to "000016".

Count start condition

• Time measurement control bit is set (=1)

Counter stop condition

• Time measurement control bit is reset (=0)

Interrupt request generation timing • When active edge of measurement pulse is input [TCIN interrupt]

• When the time underflows [Timer C interrput]

TCIN pin function

Measurement pulse input

Count value reset timing

When time measurement control bit is reset (=0)

Read from timer (Note 1)

• Count value can be read out by reading Timer C.

• Count value at measurement pulse active edge input can be read out by reading time

measurement register.

Write to timer

Cannot write to Timer C and time measurement register

Select function

• Measurement pulse active edge: selectable (rising edge/falling edge/both edges)

• Measurement pulse: selectable (input from TCIN pin/256 divisions of fRING)

• Digital filter sampling frequency: selectable (f1/f8/f32)

Note 1: The Timer C and the timer measurement register must be read in word-size.

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