7906 datasheet(219/531 Pages) RENESAS

219 / 531 page

THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-14

10.2 Block description

Fig. 10.2.11 Structures of timer A0/A1/A2 register and timer A01/A11/A21 register

10.2.8 Timer A3

Timer A3 is used to control the carrier’s period of the whole three-phase waveform and is used in the timer

mode.

Figure 10.2.12 shows the structure of the timer A3 mode register (the three-phase waveform mode).

Fig. 10.2.12 Structure of timer A3 mode register (three-phase waveform mode)

Bit name

Bit

Timer A3 mode register (Address 5916)

Function

At reset

R/W

Fix these bits to “0000002” in the three-phase waveform mode.

Count source select bits

b7 b6 b5 b4 b3 b2 b1 b0

See Table 7.2.3.

Undefined

15 to 0

Any value in the range from “000016” to “FFFF16” can be set.

Assuming that the set value = n, the “H” level width of the one-shot pulse is expressed

as follows :

Timer A0 register (Addresses 4716, 4616)

Timer A1 register (Addresses 4916, 4816)

Timer A2 register (Addresses 4B16, 4A16)

(b15)

(b8)

fi: Frequency of count source

Note: Use the MOVM or STA(STAD) instruction for writing to this register.

Writing to this register must be performed in a unit of 16 bits.

fi.

Bit

Function

At reset

R/W

Timer A01 register (Addresses D116, D016)

Timer A11 register (Addresses D316, D216)

Timer A21 register (Addresses D516, D416)

(b15)

(b8)

Undefined

15 to 0

Bit

Function

At reset

R/W

Any value in the range from 000016 to FFFF16 can be set.

Assuming that the set value = n, the “H” level width of the one-shot pulse is expressed

as follows: n/fi.

fi: Frequency of a count source

Notes 1: Use the MOVM or STA (STAD) instruction for writing to this register. Additionally, make sure writing to this register

must be performed in a unit of 16 bits.

2: This register is valid only in three-phase mode 1 of the three-phase waveform mode.

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