Datasheet

Analog-to-Digital Converter (ATD)
M68HC12B Family Data Sheet, Rev. 9.1
286 Freescale Semiconductor
17.3.9 Port AD Data Input Register
Read: Anytime
Write: Has no meaning or effect
PAD7–PAD0 — Port AD Data Input Bits
After reset, these bits reflect the state of the input pins.
PAD7–PAD0 may be used for general-purpose digital input. When the software reads PORTAD, it
obtains the digital levels that appear on the corresponding port AD pins. Pins with signals not meeting
V
IL
or V
IH
specifications will have an indeterminate value.
17.3.10 ATD Result Registers
Address: $006F
Bit 7654321Bit 0
Read: PAD7 PAD6 PAD5 PAD4 PAD3 PAD2 PAD1 PAD0
Write:
Reset: After reset, reflect the state of the inputs pins
= Unimplemented
Figure 17-12. Port AD Data Input Register (PORTAD)
ADRx0H:
ADRx1H:
ADRx2H:
ADRx3H:
ADRx4H:
ADRx5H:
ADRx6H:
ADRx7H:
$0070
$0072
$0074
$0076
$0078
$007A
$007C
$007E
Bit 7654321Bit 0
Read: Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8
Write:
Reset: Undefined
= Unimplemented
Figure 17-13. ATD Result Registers High
ADRx0L:
ADRx1L:
ADRx2L:
ADRx3L:
ADRx4L:
ADRx5L:
ADRx6L:
ADRx7L:
$0071
$0073
$0075
$0077
$0079
$007B
$007D
$007F
Bit 7654321Bit 0
Read: Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Write:
Reset: Undefined
= Unimplemented
Figure 17-14. ATD Result Registers Low