4513 datasheet(149/210 Pages) RENESAS

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APPLICATION

2.4 Serial I/O

2-46

4513/4514 Group User’s Manual

Fig. 2.4.5 Master serial I/O setting example

g0 h

Disable Interrupts

Serial I/O interrupt is temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V2

“0”

All interrupts disabled (DI instruction)

Serial I/O interrupt occurrence disabled

(TV2A instruction)

Set Serial I/O

Serial I/O mode register J1

1 1

Internal clock selected (TJ1A instruction)

Serial I/O port selected

Dividing ratio = 4 selected

g0 h

Clear Interrupt Request

Serial I/O interrupt activated condition is cleared.

Serial I/O transmit/receive

completion flag SIOF

“0”

Serial I/O interrupt activated condition cleared

(SNZSI instruction)

Note when the interrupt request is cleared

When is executed, considering the skip of the next instruction according to the

SIOF flag, insert the NOP instruction after the SNZSI instruction.

When interrupt is

not used

When interrupt is used

Set Interrupt

Interrupts except serial I/O is enabled

(EI instruction)

Set Interrupt

Serial I/O interrupt temporarily disabled is enabled.

1 !!!

Interrupt control register V2

Serial I/O interrupt occurrence

enabled (TV2A instruction)

Interrupt enable flag INTE

“1”

All interrupts enabled

(EI instruction)

Start Condition of Serial I/O operation

Slave side is enabled to receive is checked.

Pin level of control signal = “L”

Start Serial I/O Operation

Serial transfer is started (SST instruction) after checking

slave side is enabled to receive.

Check Serial I/O Interrupt Request

SIOF flag is checked (SNZSI instruction).

Serial I/O Interrupt Occur

Execute Receive Data

Data received by serial transfer is executed.

→ register A, register B (TABSI instruction)

“!”: it can be “0” or “1.”

When serial communication is executed, to are repeated.

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