MC68HC05V12 Datasheet, PDF (86/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Parallel Input/Output (I/O)
7.6 Port D
Port D is a 5-bit input-only port which shares all of its pins with the A/D
converter (AD0–AD4) as shown in Figure 7-4. The port D data register
is located at address $0003. When the A/D converter is active, one of
these five input ports may be selected by the A/D multiplexer for
conversion. A logical read of a selected input port will always return 0.
V_SS
READ $0003/2B
INTERNAL HC05
DATA BUS
TO A/D CHANNEL SELECT LOGIC
TO A/D SAMPLING CIRCUITRY
Figure 7-4. Port D Circuitry
INPUT
PIN
Technical Data
Parallel Input/Output (I/O)
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MC68HC05V12 — Rev. 2.0