HD404354 데이터 시트보기 (PDF) - Renesas Electronics

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HD404354

4-bit HMCS400-Series microcomputer

Renesas Electronics 

Port mode register C (PMRC: $025)

HD404358 Series

Bit

Initial value

Read/Write

Bit name

3

0

W

PMRC3

2

1

0

0 Undefined 0

W

W

W

PMRC2 PMRC1 PMRC0

Alarm output function.

Refer to figure 50.

PMRC0

0

1

Serial Clock Division Ratio

Prescaler output divided by 2

Prescaler output divided by 4

PMRC1

0

1

Output Level Control in Idle States

Low level

High level

Figure 56 Port Mode Register C (PMRC)

Serial Data Register (SRL: $006, SRU: $007): This register has the following functions (figures 57 and

58).

• 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 59.

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.

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

Bit

Initial value

Read/Write

Bit name

3

2

1

0

Undefined Undefined Undefined Undefined

R/W

R/W

R/W

R/W

SR3

SR2

SR1

SR0

Figure 57 Serial Data Register (SRL)

69

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