7477 datasheet(160/354 Pages) RENESAS

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1-143

7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.14 A-D converter

Processing after conversion

1 A termination of conversion can be verified by any of the following operations.

q State of A-D conversion end bit.

q State of A-D conversion interrupt request bit.

q Branch to A-D conversion interrupt routine.

2 Read the A-D conversion register to obtain a conversion result.

Notes 1: Be sure to connect VREF to a ladder resistor during A-D conversion (7470/7471 group).

2: A-D conversion is restarted at the time when the A-D conversion end bit (bit 3) of the

A-D control register is cleared to “0” during A-D conversion.

Table 1.14.1 Setting at A-D conversion

1 Port P2 direction register(P2D: Address 00C516)

(7470/7471 group)

2 Port P1-P4 pull-up control register (7470 group)

Port P1-P5 pull-up control register (7471 group)

(Address 00D116)

3 Interrupt request register 1 (IR1: Address 00FC16)

4 Interrupt control register 1 (IE1: Address 00FE16)

5 A-D conversion control register

(ADCON: Address 00D916)

Bit

b2, b1, b0

Value

Clear the bit corresponding to the used ana-

log input pin (one of pins P20/IN0 to P27/

IN7) to “0” (input mode).

Note: In the 7470 group, only pins P20/IN0

to P23/IN3 are available.

0: P20 to P23 are not pulled up.

Note: When one of pins P20/IN0 to P23/IN3

is used as an analog input pin

0: P24 to P27 are not pulled up.

Note: When one of pins P24/IN4 to P27/IN7

is used as an analog input pin

(7471 group)

0: A-D conversion interrupt disabled

1: A-D conversion interrupt enabled

• 000: P20/IN0

• 001: P21/IN1

• 010: P22/IN2

• 011: P23/IN3

• 100: P24/IN4

• 101: P25/IN5

• 110: P26/IN6

• 111: P27/IN7

Set the value corresponding to the used ana-

log input pin.

Note: In the 7470/7477 group, only pins P20/

IN0 to P23/IN3 are available.

0: During conversion (A-D conversion is started.)

1: VREF connection (7470/7471 group)

Fix this bit to “0.”

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