7906 datasheet(218/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-13

10.2.6 Port P5 direction register

The position-data input pins are multiplexed with port P5 pin.

When using these pins as position-data-input pins, clear the corresponding bits of the port P5 direction

Figure 10.2.9 shows the relationship between the port P5 direction register and position-data-input pins.

10.2 Block description

Fig. 10.2.9 Relationship between port P5 direction register and position-data-input pins

10.2.7 Timers A0 through A2

Each of timers A0 through A2 is used to control the output width of each phase, and these timers are used

in the one-shot pulse mode.

Figure 10.2.10 shows the structure of timer A0/A1/A2 mode register (in the three-phase waveform mode).

Because the underflow signal of timer A3 serves as a trigger for timers A0 through A3, it is unnecessary

to set the one-shot start bit to “1.”

Note that, in three-phase mode 1, each of timers A0 through A2 has the following two registers: timer A0/

A1/A2 register (addresses 4616 and 4716, 4816 and 4916, 4A16 and 4B16) and timer A01/A11/A21 register

(addresses D016 and D116, D216 and D316, D416 and D516). These two registers are used to control the output

width.

Figure 10.2.11 shows the structures of the timer A0/A1/A2 mode register and timer A01/A11/A21 register.

Fig. 10.2.10 Structure of timer A0/A1/A2 mode register (three-phase waveform mode)

Corresponding pin

Bit

4 to 0

Port P5 direction register (Address D16)

Functions

At reset

R/W

Nothing is assigned.

Pin IDW (Pin INT5/TB0IN)

Pin IDV (Pin INT6/TB1IN)

Pin IDU (Pin INT7/TB2IN)

—

b7 b6 b5 b4 b3 b2 b1 b0

Note: The pins in ( ) are I/O pins of other internal peripheral devices, which are multiplexed.

0 : Input mode

1 : Output mode

When using this pin as a position-data input pin,

be sure to clear the corresponding bit to “0.”

Undefined

Bit name

Bit

Timer A0/A1/A2 mode register (Addresses 5616 to 5816)

Function

At reset

R/W

Fix these bits to “0110102” in the three-phase waveform mode.

Count source select bits

b7 b6 b5 b4 b3 b2 b1 b0

See Table 7.2.3.

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