UPD17062 datasheet(207/298 Pages) RENESAS

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µPD17062

16.1.3

SIO0MS

The SIO0MS flag specifies the serial interface clock to be used.

When the SIO0MS flag is set to 0, the external clock is selected. When the SIO0MS flag is set to 1, the internal

clock is selected. When the internal clock is selected, its frequency is set by the shift clock frequency register

(RF: 39H).

When the SIO0MS flag is set to 0 in two-wire bus mode, slave operation is specified. When the SIO0MS

flag is set to 1 in two-wire bus mode, master operation is specified.

Table 16-6

SIO0MS Flag Functions

16.1.4

SIO0TX

If the SIO0TX flag is set to 0 in two-wire bus mode, reception mode is specified. If the SIO0TX flag is set

to 1 in two-wire bus mode, transmission mode is specified.

If the SIO0TX flag becomes 0 upon specifying CH0 serial I/O mode, SI mode (the SDA pin is in input mode)

is specified. If the SIO0TX flag becomes 1 upon specifying CH0 serial I/O mode, SO mode (the SDA pin is in

output mode) is specified.

When the CH1 serial I/O mode is specified, the SIO0TX flag specifies whether the SO pin is to be used as

a serial interface. When the SIO0TX flag is set to 1, the SO pin is used as an SO pin. When the SIO0TX flag

is set to 0, the SO pin is used as a general-purpose port.

Table 16-7

SIO0TX Flag Functions

SIO0MS

Function

Two-wire bus mode : Slave operation

Serial I/O mode

: External clock operation

Two-wire bus mode : Master operation

Serial I/O mode

: Internal clock operation

SIO0TX

Function

Two-wire bus mode : RX (reception) mode

CH0 serial I/O mode : SI mode

CH1 serial I/O mode : P0A3 is used as a general-purpose port

Two-wire bus mode : TX (transmission) mode

CH0 serial I/O mode : SO mode

CH1 serial I/O mode : P0A3 is used as an SO pin

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