SH7041A datasheet(374/923 Pages) RENESAS

Part #	SH7041A

Description	Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

PDF	923 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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12.4.5

Cascade Connection Mode

Cascade connection mode is a function that connects the 16-bit counters of two channels together

to act as a 32-bit counter.

This function operates by using the TPSC2–TPSC0 bits of the TCR register to set the channel 1

counter clock to count by TCNT2 counter overflow/underflow.

Note:

When channel 1 is set to phase counting mode, the counter clock settings become

ineffective.

Table 12.6 shows the cascade connection combinations.

Table 12.6

Cascade Connection Combinations

Combination

Upper 16 Bits

Lower 16 Bits

Channel 1, channel 2

TCNT1

TCNT2

Procedure for Setting Cascade Connection Mode (Figure 12.22):

1.Set the TPSC2–TPSC 0 bits of the channel 1 timer control register (TCR) to B'111 to select

“count by TCNT2 overflow/underflow.”

2.Set the CST bits corresponding to the upper and lower 16 bits in the TSTR to 1 to start the

count operation.

Cascade connection operation

Select cascade connection

Start counting

Cascade connection operation

Figure 12.22 Procedure for Selecting Cascade Connection Mode

SH7041A Datasheet(PDF) 374 Page - Renesas Technology Corp