HD404369F datasheet(84/117 Pages) RENESAS

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HD404369 Series

Serial Data Register (SRL: $006, SRU: $007): This register has the following functions (figures 64 and

65).

• Transmission data write and shift

• Receive data shift and read

Writing data in this register is output from the SO pin, LSB first, synchronously with the falling edge of the

transmit clock; data is input, LSB first, through the SI pin at the rising edge of the transmit clock.

Input/output timing is shown in figure 66.

Data cannot be read or written during serial data transfer. If a read/write occurs during transfer, the

accuracy of the resultant data cannot be guaranteed.

Bit

Initial value

Read/Write

Bit name

Undefined

R/W

SR3

Undefined

R/W

SR2

Undefined

R/W

SR0

Undefined

R/W

SR1

Serial data register (lower digit) (SRL: $006)

Figure 64 Serial Data Register (SRL)

Bit

Initial value

Read/Write

Bit name

Undefined

R/W

SR7

Undefined

R/W

SR6

Undefined

R/W

SR4

Undefined

R/W

SR5

Serial data register (upper digit) (SRU: $007)

Figure 65 Serial Data Register (SRU)

LSB

MSB

Transmit clock

Serial output

data

Serial input data

latch timing

Figure 66 Serial Interface Output Timing

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