HCS08 datasheet(144/374 Pages) NXP

144 / 374 page

Analog-to-Digital Converter (S08ADC12V1)

MC9S08JM60 Series Data Sheet, Rev. 5

144

Freescale Semiconductor

10.3.8

Pin Control 1 Register (APCTL1)

The pin control registers disable the I/O port control of MCU pins used as analog inputs. APCTL1 is used

to control the pins associated with channels 0–7 of the ADC module.

3:2

MODE

Conversion Mode Selection. MODE bits are used to select between 12-, 10-, or 8-bit operation. See Table 10-8.

1:0

ADICLK

Input Clock Select. ADICLK bits select the input clock source to generate the internal clock ADCK. See

Table 10-9.

Table 10-7. Clock Divide Select

ADIV

Divide Ratio

Clock Rate

Input clock

÷ 2

Input clock

÷ 4

Input clock

÷ 8

Table 10-8. Conversion Modes

MODE

Mode Description

8-bit conversion (N=8)

12-bit conversion (N=12)

10-bit conversion (N=10)

Reserved

Table 10-9. Input Clock Select

ADICLK

Selected Clock Source

Bus clock

Bus clock divided by 2

Alternate clock (ALTCLK)

Asynchronous clock (ADACK)

ADPC7

ADPC6

ADPC5

ADPC4

ADPC3

ADPC2

ADPC1

ADPC0

Reset:

Figure 10-10. Pin Control 1 Register (APCTL1)

Table 10-6. ADCCFG Register Field Descriptions (continued)

Field

Description

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