4502 datasheet(153/214 Pages) RENESAS

153 / 214 page

2.4 A/D converter

2-36

Rev.2.01

Feb 02, 2005

4502 Group

APPLICATION

REJ09B0193-0201

Fig. 2.4.2 A/D conversion mode setting example

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)

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.

4502 Datasheet(PDF) 153 Page - Renesas Technology Corp

4502 Datasheet(HTML) 153 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL