MC9S12HZ256 Datasheet, PDF (231/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 7 Analog-to-Digital Converter (ATD10B16CV4)
7.3.2.14 Port Data Register 0 (PORTAD0)
The data port associated with the ATD is input-only. The port pins are shared with the analog A/D inputs
AN[15:8].
R
W
Reset
Pin
Function
7
PTAD15
1
AN15
6
PTAD14
5
PTAD13
4
PTAD12
3
PTAD11
2
PTAD10
1
1
1
1
1
AN14
AN13
AN12
AN11
AN10
= Unimplemented or Reserved
Figure 7-16. Port Data Register 0 (PORTAD0)
Read: Anytime
Write: Anytime, no effect
The A/D input channels may be used for general-purpose digital input.
Table 7-25. PORTAD0 Field Descriptions
1
PTAD9
1
AN9
0
PTAD8
1
AN8
Field
Description
7:0
PTAD[15:8]
A/D Channel x (ANx) Digital Input Bits— If the digital input buffer on the ANx pin is enabled (IENx = 1) or
channel x is enabled as external trigger (ETRIGE = 1, ETRIGCH[3-0] = x, ETRIGSEL = 0) read returns the
logic level on ANx pin (signal potentials not meeting V_IL or V_IH specifications will have an indeterminate value)).
If the digital input buffers are disabled (IENx = 0) and channel x is not enabled as external trigger, read returns
a “1”.
Reset sets all PORTAD0 bits to “1”.
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
231