MC9S08AC16_08 Datasheet, PDF (253/344 Pages) Freescale Semiconductor, Inc – 8-Bit HCS08 Central Processor Unit (CPU)

Chapter 14
Analog-to-Digital Converter (S08ADC10V1)
14.1 Overview
The 10-bit analog-to-digital converter (ADC) is a successive approximation ADC designed for operation
within an integrated microcontroller system-on-chip. The ADC module design supports up to 28 separate
analog inputs (AD0-AD27). Only 9 (AD0-AD3, AD8-AD11, and AD27) of the possible inputs are
implemented on the MC9S08AC16 Series Family of MCUs. These inputs are selected by the ADCH bits.
Some inputs are shared with I/O pins as shown in Figure 14-1. All of the channel assignments of the ADC
for the MC9S08AC16 Series devices are summarized in Table 14-1.
14.2 Channel Assignments
The ADC channel assignments for the MC9S08AC16 Series devices are shown in the table below.
Channels that are unimplemented are internally connected to V_REFL. Reserved channels convert to an
unknown value. Channels which are connected to an I/O pin have an associated pin control bit as shown.
ADCH
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
Channel
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD8
AD9
AD10
AD11
AD12
AD13
AD14
AD15
Table 14-1. ADC Channel Assignment
Input
PTB0/AD1P0
PTB1/AD1P1
PTB2/AD1P2
PTB3/AD1P3
V_REFL
V_REFL
V_REFL
V_REFL
PTD0/AD1P8
PTD1/AD1P9
PTD2/AD1P10
PTD3/AD1P11
V_REFL
V_REFL
V_REFL
V_REFL
Pin Control
ADPC0
ADPC1
ADPC2
ADPC3
N/A
N/A
N/A
N/A
ADPC8
ADPC9
ADPC10
ADPC11
N/A
N/A
N/A
N/A
ADCH
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Channel
AD16
AD17
AD18
AD19
AD20
AD21
AD22
AD23
AD24
AD25
AD26
AD27
V_REFH
V_REFL
module
disabled
Input
V_REFL
V_REFL
V_REFL
V_REFL
V_REFL
V_REFL
Reserved
Reserved
Reserved
Reserved
Temp Sensor
Internal Bandgap
Reserved
V_REFH
V_REFL
None
Pin Control
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
MC9S08AC16 Series Data Sheet, Rev. 6
Freescale Semiconductor
253