Renesas MN4 Manuel d'utilisateur télécharger pdf (Page 9)

V850E2/MN4 Timer Array Unit Control

R01AN0922EJ0100 Rev.1.00 Page 9 of 54

Jan 13, 2012

4.3 Details of TAUJ Setup

In this sample program, the TAUJ0 is set to independent channel operation and signal width measurement function.

Channel 0 is set to capture & one count mode. The TAUJ0TTIN0 pin is used to measure the input signal width (HIGH).

The counter is enabled by setting the channel trigger bit TAUJ0TS.TAUJ0TS0 to 1. Then, bit TAUJ0TE.TAUJ0TE0 is

set to 1 and counting is enabled. When a valid start edge of TAUJ0TTIN0 is detected, the TAUJ0CNT0 counter starts

counting up from 00000000H. When a valid stop edge of TAUJ0TTIN0 is detected, the value of TAUJ0CNT0 is

captured and transferred to TAUJ0CDR0 and then interrupt INTTAUJ0I0 is generated. The counter retains its value and

await the next valid start edge of TAUJ0TTIN0.

If the counter reaches FFFFFFFFH before a valid stop edge of TAUJ0TTIN0 is detected, it overflows. The counter is

reset to 00000000H and then continues to operate. The values transferred to TAUJ0CDR0 and

TAUJ0CSR0.TAUJ0OVF respectively depend on the values of bits TAUJ0CMOR0.TAUJ0COS[1:0]. See

“V850E2/MN4 Hardware User Manual: Renesas MCU V850E2/Mx4 microcontrollers (R01UH0011EJ)” for details.

TAUJ0TTIN0 input signal width = count clock cycle × [(TAUJ0CSR0.TAUJ0OVF ×(FFFFFFFFH + 1)) +

TAUJ0CDR0 capture value + 1]

TAUJnTTINm

CK3-0

TAU UnTS.TAUUnTSm

INTTAUJ nIm

Capture & one

count mode

Count

clock

Start &

capture

trigger

INT

TAU UnCNT m

TAU UnCDR m

TAUUnTRO.

TAAUnTROm

TAU Un T RO .

TAAUnTROm

Cl o ck s el e ct orTrigger selector

Edge

selec tor

Sim ultaneou s

rewrite trigger

from upper

channel

Tr igge r fr om up per chann el

Start trigger from master

INT num ber fro m ma ster

INT numberfrom

upper channel

Trigger from lower channel

Figure 4.5 Block Diagram for Input Signal Width Measurement Function

TAUJnTS.TAUJnTSm

TA U JnTE .TA UJnTE m

TAU J nTT INm

TAUJnCNTm

TA U JnCDR m

FFFF FFFFH

0000 0000H

INTTAUJnIm

TAUJnCSRm.TAUJnOVF

Figure 4.6 General Timing Diagram for Input Signal Width Measurement Function

For specific mode setup, see “V850E2/MN4 Hardware User Manual: Renesas MCU V850E2/Mx4 microcontrollers

(R01UH0011EJ).”

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Renesas MN4 Manuel d'utilisateur Page 9

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