HD404019RFS datasheet(23/65 Pages) RENESAS

23 / 65 page

HD404019R Series

Serial Interrupt Request Flag (IFS: $003, Bit 0): The serial interrupt request flag will be set when the

octal counter counts eight transmit clock

signals, or when data transfer is discontinued by resetting the

octal counter. Refer to table 8.

Table 8

Serial Interrupt Request Flag

IFS

Interrupt Request

0No

Yes

Serial Interrupt Mask (IMS: $003, Bit 1): The serial interrupt mask masks the interrupt request. Refer to

table 9.

Table 9

Serial Interrupt Mask

IMS

Interrupt Request

Enabled

Disabled (masked)

Selection and Change of the Operation Mode: Table 10 shows the serial interface operation modes

which are determined by a combination of the value in the port mode register and in the serial mode

Initialize the serial interface by a write signal to the serial mode register when the operation mode has

changed.

Table 10

Serial Interface Operation Mode

SMR3

PMR1

PMR0

Serial Interface Operating Mode

Clock continuous output mode

Transmit mode

Receive mode

Transmit/receive mode

Operating State of Serial Interface: The serial interface has three operating states: the STS waiting state,

transmit clock wait state, and transfer state, as shown in figure 11.

The STS waiting state is the initialization state of the serial interface. The serial interface enters this state in

one of two ways: either by the operation mode changing through a change in the data in the port mode

operate even if the transmit clock is applied. If the STS instruction is executed, the serial interface shifts to

the transmit clock wait state.

HD404019RFS Datasheet(PDF) 23 Page - Renesas Technology Corp