NEC PD78P214 Manuale Utente
92
µ
PD78214 Sub-Series
5.7.5 Note
When P66 and P67 are used as analog input pins AN6 and AN7 respectively or when A/D conversion is not
performed, do not apply a voltage out of the range AV
performed, do not apply a voltage out of the range AV
SS
through AV
REF
to these pins, if AN6 and AN7 are selected
for ANI0 through ANI2 of the A/D converter mode register (ADM).
See Chapter 8 for details.
5.8 PORT 7
Port 7 is a 6-bit input-only port. It functions as A/D converter analog input pins (AN0 through AN5) as well as input
port pins.
port pins.
The level of each pin of port 7 can be read and tested, although it is a dual-function pin.
5.8.1 Hardware Configuration
Fig. 5-43 shows the hardware configuration of port 7.
Fig. 5-43 Block Diagram of Port 7
Internal bus
RD
IN
P7n
n = 0 to 5
n = 0 to 5
Analog input
5.8.2 Setting the I/O Mode and Control Mode
Port 7 is an input-only port.
Port 7 is designed so that it can always receive analog inputs. Therefore, it is unnecessary to specify a mode.
The ADM register for the A/D converter is used to specify the mode of A/D converter operation. (See Chapter 8
for details.)
for details.)