4501 datasheet(152/212 Pages) RENESAS

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2.4 A/D converter

2-35

4501 Group

APPLICATION

Rev.2.01

Feb 07, 2005

REJ09B0192-0201

Fig. 2.4.2 A/D conversion mode setting example

b3b0

➀ Disable Interrupts

A/D interrupt is temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V2

“0”

All interrupts disabled (DI instruction)

A/D interrupt occurrence disabled

(TV2A instruction)

➁ Set A/D Converter

A/D conversion mode is selected to A/D operation mode.

Analog input pin AIN0 is selected.

A/D control register Q1

A/D conversion mode, AIN0 selected

(TQ1A instruction)

b3b0

0 0

➂ Clear Interrupt Request

A/D interrupt activated condition is cleared.

A/D conversion completion flag ADF “0”

A/D conversion interrupt activated condition cleared

(SNZAD instruction)

Note when the interrupt request is cleared

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

flag ADF, insert the NOP instruction after the SNZAD instruction.

When interrupt is

not used

When interrupt is used

➃ Set Interrupt

Interrupts except A/D conversion is

enabled (EI instruction)

➃ Set Interrupt

A/D conversion interrupt temporarily disabled is enabled.

✕✕ ✕

Interrupt control register V2

A/D interrupt occurrence enabled

(TV2A instruction)

Interrupt enable flag INTE

“1”

All interrupts enabled

(EI instruction)

➄ Start A/D Conversion

A/D conversion operation is started (ADST instruction).

When interrupt is not used

When interrupt is used

➅ Check A/D Interrupt Request

A/D conversion completion flag is

checked (SNZAD instruciton)

➅ A/D Conversion Interrupt Occur

➆ Execute A/D Conversion

High-order 8 bits of register AD

→ Register A and register B (TABAD instruction)

Low-order 2 bits of register AD

→ High-order 2 bits of register A (TALA instruction)

“0” is set to low-order 2 bits of register A

“✕”: it can be “0” or “1.”

When A/D conversion is executed by the same channel, ➄ to ➆ is repeated.

When A/D conversion is executed by the another channel, ➀ to ➆ is repeated.

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