EM78P259N/260N

8-Bit Microprocessor with OTP ROM

Bit 4 (ADRUN): ADC starts to RUN.

0 = reset on completion of the conversion. This bit cannot be reset though software.

1 = an AD conversion is started. This bit can be set by software.

Bit 3 (ADPD): ADC Power-down mode.

 

0

= switch off the resistor reference to save power even

 

 

while the CPU is operating.

 

1

= ADC is operating

Bit 2:

Not used

Bit 1 ~ Bit 0 (ADIS1 ~ ADIS0): Analog Input Select

00= ADIN0/P50

01= ADIN1/P51

10= ADIN2/P52

11 = ADIN3/P53

These bits can only be changed when the ADIF bit and the ADRUN bit are both LOW.

6.7.1.3RA (ADOC: AD Offset Calibration Register)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit

2

Bit

1

Bit

0

CALI

SIGN

VOF[2]

VOF[1]

VOF[0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit 7 (CALI): Calibration enable bit for ADC offset 0 = Calibration disable

1 = Calibration enable

Bit 6 (SIGN): Polarity bit of offset voltage 0 = Negative voltage

1 = Positive voltage

Bit 5 ~ Bit 3 (VOF[2] ~ VOF[0]): Offset voltage bits.

VOF[2]

VOF[1]

VOF[0]

 

 

 

 

 

0

0

0

 

0

0

1

 

0

1

0

 

0

1

1

 

1

0

0

 

1

0

1

 

1

1

0

 

1

1

1

 

 

 

 

 

EM78P259N/260N

0LSB

2LSB

4LSB

6LSB

8LSB

10LSB

12LSB

14LSB

ICE259N

0LSB

1LSB

2LSB

3LSB

4LSB

5LSB

6LSB

7LSB

Bit 2 ~ Bit 0: Unimplemented, read as ‘0’.

46 •

Product Specification (V1.2) 05.18.2007

 

(This specification is subject to change without further notice)

Page 52
Image 52
IBM EM78P259N/260N manual While the CPU is operating, = ADC is operating, RA Adoc AD Offset Calibration Register