Microcontrollers Data Sheet

I/O Registers

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

Freescale Semiconductor 53

The voltage levels supplied from internal reference nodes as specified in Table 3-1 are used to verify

the operation of the ADC both in production test and for user applications.

Table 3-1. Mux Channel Select

ADCH4 ADCH3 ADCH2 ADCH1 ADCH0 Input Select

00000 PTB0/ATD0

00001 PTB1/ATD1

00010 PTB2/ATD2

00011 PTB3/ATD3

00100 PTB4/ATD4

00101 PTB5/ATD5

00110 PTB6/ATD6

00111 PTB7/ATD7

01000 PTC0/ATD8

01001

PTC1/ATD9

(1)

1. ATD9 is not available in the 56-pin SDIP package.

01010

Unused

(2)

01011 Ø

01100 Ø

01101 Ø

01110 Ø

01111 Ø

10000 Ø

11010

Unused

(2)

2. Used for factory testing.

11011

Reserved

(3)

3. If any unused channels are selected, the resulting ADC conversion will be unknown.

1 1 0 0

Unused

(2)

1 1 1 0 1

REFH

1 1 1 1 0

REFL

1 1 1 1 1 ADC power off