SH7243 datasheet(562/1726 Pages) RENESAS

562 / 1726 page

Section 11 Multi-Function Timer Pulse Unit 2 (MTU2)

Rev. 1.00 Jun. 26, 2008 Page 532 of 1692

REJ09B0393-0100

(2)

Examples of Buffer Operation

(a)

When TGR is an output compare register

Figure 11.17 shows an operation example in which PWM mode 1 has been designated for channel

0, and buffer operation has been designated for TGRA and TGRC. The settings used in this

example are TCNT clearing by compare match B, 1 output at compare match A, and 0 output at

compare match B. In this example, the TTSA bit in TBTM is cleared to 0.

As buffer operation has been set, when compare match A occurs the output changes and the value

in buffer register TGRC is simultaneously transferred to timer general register TGRA. This

operation is repeated each time that compare match A occurs.

For details of PWM modes, see section 11.4.5, PWM Modes.

TCNT value

TGRB_0

H'0000

TGRC_0

TGRA_0

H'0200

H'0520

TIOCA

H'0200

H'0450

H'0520

H'0450

TGRA_0

H'0450

H'0200

Transfer

Time

Figure 11.17 Example of Buffer Operation (1)

(b)

When TGR is an input capture register

Figure 11.18 shows an operation example in which TGRA has been designated as an input capture

Counter clearing by TGRA input capture has been set for TCNT, and both rising and falling edges

have been selected as the TIOCA pin input capture input edge.

As buffer operation has been set, when the TCNT value is stored in TGRA upon the occurrence of

input capture A, the value previously stored in TGRA is simultaneously transferred to TGRC.

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