TMP88CS38FG datasheet(67/226 Pages) TOSHIBA

67 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-67

Note 1: Be sure to read the captured value from TC1DRB before the next trigger edge is

detected. If fail to read it, it becomes undefined. It is recommended that a 16-bit access

instruction be used to read from TC1DRB.

Note 2: If either the falling or rising edge is used in capturing values, the counter stops at “1”

after a value has been captured until the next edge is detected. So, the value captured

next will become “1” larger than the value captured right after capturing starts.

Note 3: In the Pulse width measurement mode, the capture value of the first time after the timer

starts might not be a correct value. Thus, execute the dummy read once.

Example: Duty measurement (Resolution fc/2

7 [Hz] DV1CK

= 0)

CLR

(INTTC1SW). 0

;

INTTC1 service switch initial setting:

Clears bit0 of INTTC1SW. This bit is inverted by

CPL instruction before INTTC1 is generated.

(TC1CR), 00000110B

;

Sets the TC1 mode and source clock

SET

(EIRL). 4

;

Enables INTTC1

(TC1CR), 00100110B

;

Starts TC1 with an external trigger at MCAP1

= 0

PINTTC1:

CPL

(INTTC1SW). 0

;

Complements INTTC1 service switch

JRS

F, SINTTC1

WA, (TC1DRBL)

;

Reads TC1DRB (“H” level pulse width)

Lower address in TC1DRBL: TC1DRB

(HPULSE), WA

RETI

SINTTC1:

WA, (TC1DRBL)

(WIDTH), WA

;

Reads TC1DRB (Period)

RETI

;

Duty calculation

VINTTC1:

PINTTC1

;

Sets INTTC1

HPULSE

WIDTH

TC1 pin

INTTC1

INTTC1SW

TMP88CS38FG Datasheet(PDF) 67 Page - Toshiba Semiconductor

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