TMP88CS38FG datasheet(76/226 Pages) TOSHIBA

76 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-76

2.7.3

Function

The timer/counter 3 has three operating modes: timer, event counter, and capture mode.

When it is used in the capture mode, the noise rejection time of TC3 pin input can be set

by remote control receive control register.

(1) Timer mode

In this mode, the internal clock is used for counting up. The contents of TC3DRA are

compared with the contents of up counter. If a match is found, a timer/counter 3

interrupt (INTTC3) is generated, and the up counter is cleared. The current contents of

up counter are loaded into TC3DRB by setting ACAP (Bit6 in TC3CR) to “1”

(Auto-capture function).

The contents of up counter can be easily confirmed by executing the read instruction

(RD instruction) of TC3DRB. Loading the contents of up counter is not synchronized

with counting up. The contents of over flow (FFH) and 00H can not be loaded correctly.

It is necessary to consider the count cycle.

Table 2.7.1 Source Clock (Internal clock) for Timer/Counter 3 (Example: at fc

= 16.0 MHz)

NORMAL, IDLE Mode

DV1CK

= 0

DV1CK

= 1

TC3CK

Resolution [

μs]

Maximum Setting

Time [ms]

Resolution [

μs]

Maximum Setting

Time [ms]

000

512

130.6

1024

261.1

001

256

65.3

512

130.6

010

128

32.6

256

65.3

011

16.3

128

32.6

100

8.2

16.3

101

4.1

8.2

110

2.0

4.1

FF/00

Counter

Clock

TC3DRB

TMP88CS38FG Datasheet(PDF) 76 Page - Toshiba Semiconductor

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