Datasheet

MC9S08AC16 Series Data Sheet, Rev. 9
Freescale Semiconductor 243
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.
NOTE
Ignore any references to stop1 low-power mode in this chapter, because the
MC9S08AC16 Series does not support it.
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.
Table 14-1. ADC Channel Assignment
ADCH Channel Input Pin Control ADCH Channel Input Pin Control
00000 AD0 PTB0/AD1P0 ADPC0 10000 AD16 V
REFL
N/A
00001 AD1 PTB1/AD1P1 ADPC1 10001 AD17 V
REFL
N/A
00010 AD2 PTB2/AD1P2 ADPC2 10010 AD18 V
REFL
N/A
00011 AD3 PTB3/AD1P3 ADPC3 10011 AD19 V
REFL
N/A
00100 AD4 V
REFL
N/A 10100 AD20 V
REFL
N/A
00101 AD5 V
REFL
N/A 10101 AD21 V
REFL
N/A
00110 AD6 V
REFL
N/A 10110 AD22 Reserved N/A
00111 AD7 V
REFL
N/A 10111 AD23 Reserved N/A
01000 AD8 PTD0/AD1P8 ADPC8 11000 AD24 Reserved N/A
01001 AD9 PTD1/AD1P9 ADPC9 11001 AD25 Reserved N/A
01010 AD10 PTD2/AD1P10 ADPC10 11010 AD26 Temp Sensor N/A
01011 AD11 PTD3/AD1P11 ADPC11 11011 AD27 Internal Bandgap N/A
01100 AD12 V
REFL
N/A 11100 Reserved N/A
01101 AD13 V
REFL
N/A 11101 V
REFH
V
REFH
N/A
01110 AD14 V
REFL
N/A 11110 V
REFL
V
REFL
N/A