D78F9189CT 查看數據表（PDF） - NEC => Renesas Technology
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D78F9189CT Datasheet PDF : 247 Pages
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CHAPTER 2 PIN FUNCTIONS
(g) ASCK20
This is the serial clock input pin of the asynchronous serial interface.
Caution When using P20 to P26 as serial interface pins, the input/output mode and output latch
must be set according to the functions to be used. For details of the setting, see Table
14-2 Serial Interface 20 Operating Mode Settings.
2.2.4 P30 to P33 (Port 3)
These pins constitute a 4-bit I/O port. In addition, these pins function as the timer input/output and the external
interrupt input.
Port 3 can be set to the following operation modes in 1-bit units.
(1) Port mode
In port mode, P30 to P33 function as a 4-bit I/O port. Port 3 can be set to input or output mode in 1-bit units
by using port mode register 3 (PM3). Whether to use the on-chip pull-up resistor can be specified in 1-bit
units by using pull-up resistor option register B3 (PUB3), regardless of the setting of port mode register 3
(PM3).
(2) Control mode
In this mode, P30 to P33 function as the timer input/output and the external interrupt input.
(a) TI81
This is the external clock input pin for 8-bit timer/event counter 81.
(b) TO90, TO81, TO82
These are the output pins of 16-bit timer 90, 8-bit timer/event counter 81, and 8-bit timer 82.
(c) CPT90
This is the capture edge input pin of 16-bit timer 90.
(d) BZO90
This is the buzzer output pin of 16-bit timer 90.
(e) INTP0 to INTP3
These are external interrupt input pins for which the valid edge (rising edge, falling edge, and both the
rising and falling edges) can be specified.
2.2.5 P50 to P53 (Port 5)
These pins constitute a 4-bit N-ch open-drain I/O port. Port 5 can be set to input or output mode in 1-bit units by
using port mode register 5 (PM5). For a mask ROM version, whether a pull-up resistor is to be incorporated can be
specified by a mask option.
User’s Manual 2nd edition
25
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