MC68HC08AS32A Datasheet, PDF (162/296 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Input/Output (I/O) Ports
pin. The data latch can always be written, regardless of the state of its data
direction bit. Table 12-3 summarizes the operation of the port C pins.
Table 12-3. Port C Pin Functions
DDRC
Bit
PTC
Bit
I/O Pin
Mode
Accesses
to DDRC
Read/Write
Accesses to PTC
Read
Write
[7] = 0 PTC2
Input, Hi-Z
DDRC[7]
0
PTC2
[7] = 1 PTC2 Output, MCLK
DDRC[7]
Data Latch
—
0
X
Input, Hi-Z
DDRC[4:0]
Pin
PTC[4:3, 1:0]⁽¹⁾
1
X
Output
DDRC[4:0]
PTC[4:0]
PTC[4:3, 1:0]
X = Don’t Care
Hi-Z = High Impedance
1. Writing affects data register, but does not affect input.
12.5 Port D
Port D is an 8-bit special-function I/O port that shares all of its pins with the
analog-to-digital converter (ADC).
12.5.1 Port D Data Register
The port D data register contains a data latch for the seven port D pins.
Address:
Read:
Write:
Reset:
Alternate
Functions:
$0003
Bit 7
0
6
PTD6
ATD14/
TCLK
5
PTD5
ATD13
4
3
PTD4
PTD3
Unaffected by Reset
ATD12 ATD11
2
PTD2
ATD10
1
PTD1
ATD9
Bit 0
PTD0
ATD8
= Unimplemented
Figure 12-11. Port D Data Register (PTD)
PTD[6:0] — Port D Data Bits
PTD[6:0] are read/write, software programmable bits. Data direction of PTD[6:0]
pins are under the control of the corresponding bit in data direction register D.
ATD[14:8] — ADC Channel Status Bits
PTD6/ATD14/TCLK–PTD0/ATD8 are seven of the 15 analog-to-digital
converter channels. The ADC channel select bits, CH[4:0], determine whether
the PTD6/ATD14/TCLK–PTD0/ATD8 pins are ADC channels or
general-purpose I/O pins. If an ADC channel is selected and a read of this
Data Sheet
162
Input/Output (I/O) Ports
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Go to: www.freescale.com
MC68HC08AS32A — Rev. 1
MOTOROLA