Справочник Пользователя для IBM EM78P259N/260N
EM78P259N/260N
8-Bit Microprocessor with OTP ROM
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Product Specification (V1.2) 05.18.2007
(This specification is subject to change without further notice)
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.
are both LOW.
6.7.1.3
RA (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]
EM78P259N/260N
ICE259N
0 0 0
0LSB
0LSB
0 0 1
2LSB
1LSB
0 1 0
4LSB
2LSB
0 1 1
6LSB
3LSB
1 0 0
8LSB
4LSB
1 0 1
10LSB 5LSB
1 1 0
12LSB 6LSB
1 1 1
14LSB 7LSB
Bit 2 ~ Bit 0:
Unimplemented, read as ‘0’.