HCS08 datasheet(143/374 Pages) NXP

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Analog-to-Digital Converter (S08ADC12V1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

143

In 10-bit mode, the ADCCVH register holds the upper two bits of the 10-bit compare value (ADCV[9:8]).

These bits are compared to the upper two bits of the result following a conversion in 10-bit mode when the

compare function is enabled.

In 8-bit mode, ADCCVH is not used during compare.

10.3.6

Compare Value Low Register (ADCCVL)

This register holds the lower 8 bits of the 12-bit or 10-bit compare value or all 8 bits of the 8-bit compare

value. When the compare function is enabled, bits ADCV[7:0] are compared to the lower 8 bits of the

result following a conversion in 12-bit, 10-bit or 8-bit mode.

10.3.7

Configuration Register (ADCCFG)

ADCCFG selects the mode of operation, clock source, clock divide, and configures for low power and long

sample time.

ADCV7

ADCV6

ADCV5

ADCV4

ADCV3

ADCV2

ADCV1

ADCV0

Reset:

Figure 10-8. Compare Value Low Register (ADCCVL)

ADLPC

ADIV

ADLSMP

MODE

ADICLK

Reset:

Figure 10-9. Configuration Register (ADCCFG)

Table 10-6. ADCCFG Register Field Descriptions

Field

Description

ADLPC

Low-Power Configuration. ADLPC controls the speed and power configuration of the successive approximation

converter. This optimizes power consumption when higher sample rates are not required.

0 High speed configuration

1 Low power configuration:The power is reduced at the expense of maximum clock speed.

6:5

ADIV

Clock Divide Select. ADIV selects the divide ratio used by the ADC to generate the internal clock ADCK.

Table 10-7 shows the available clock configurations.

ADLSMP

Long Sample Time Configuration. ADLSMP selects between long and short sample time. This adjusts the

sample period to allow higher impedance inputs to be accurately sampled or to maximize conversion speed for

lower impedance inputs. Longer sample times can also be used to lower overall power consumption when

continuous conversions are enabled if high conversion rates are not required.

0 Short sample time

1 Long sample time

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