TMP88CS38FG datasheet(63/226 Pages) TOSHIBA

63 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-63

2.5.3

Function

Timer/counter 1 has five operating modes: timer, external trigger timer, event counter,

window, pulse width measurement.

(1) Timer mode

In this mode, counting up is performed using the internal clock. The contents of

TC1DRA are compared with the contents of up counter. If a match is found, an INTTC1

interrupt is generated, and the counter is cleared to “0”. Counting up resumes after the

counter is cleared. The current contents of up counter can be transferred to TC1DRB

by setting ACAP1 (Bit6 in TC1CR) to “1” (Software capture function). (Auto-capture

function)

Table 2.5.1 Source Clock (Internal clock) for Timer/Counter 1 (Example: at fc

= 16.0 MHz)

NORMAL, IDLE mode

DV1CK

= 0

DV1CK

= 1

TC1CK

Resolution [

μs]

Maximum time

setting [s]

Resolution [

μs]

Maximum time

setting [s]

128.0

8.39

256.0

16.78

8.0

0.524

16.0

1.049

0.5

32.77 m

1.0

65.54 m

Example 1:

Sets the timer mode with source clock fc/2

11 [Hz] and generates an interrupt 1 later (at fc

= 16 MHz)

LDW

(TC1DRA), 1E84H

;

Sets the timer register

(1 s

÷ 211/fc = 1E84H)

SET

(EIRL). 4

;

Enable INTTC1

(TC1CR), 00000000B

;

Selects the source clock and mode

(TC1CR), 00010000B

;

Starts TC1

Example 2:

Auto capture

(TC1CR), 01010000B

;

ACAP1

← 1 (Capture)

;

Wait at least one cycle of the internal source clock

WA, (TC1DRB)

;

Reads the capture value

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