Datasheet
78K0/Kx2-L CHAPTER 4 PORT FUNCTIONS
R01UH0028EJ0400 Rev.4.00 162
Sep 27, 2010
4.2.8 Port 12
78K0/KY2-L
(
μ
PD78F055x)
78K0/KA2-L
(
μ
PD78F056x)
78K0/KB2-L
(
μ
PD78F057x)
78K0/KC2-L
(
μ
PD78F058x)
16 Pins 20 Pins 25 Pins 32 Pins 30 Pins 40 Pins 44, 48 Pins
− − − −
P120/EXLVI/
INTP0
P120/EXLVI/
INTP0
P120/EXLVI/
INTP0(/SO11)
P121/X1/
TOOLC0
P121/X1/
TOOLC0
P121/X1/
TOOLC0
(/TI000)
(/INTP0)
P121/X1/
TOOLC0
(/TI000)
(/INTP0)
P121/X1/
TOOLC0
P121/X1/
TOOLC0
P121/X1/
TOOLC0
P122/X2/
EXCLK/
TOOLD0
P122/X2/
EXCLK/
TOOLD0
P122/X2/
EXCLK/
TOOLD0
P122/X2/
EXCLK/
TOOLD0
P122/X2/
EXCLK/
TOOLD0
P122/X2/
EXCLK/
TOOLD0
P122/X2/
EXCLK/
TOOLD0
− − − − −
P123/XT1 P123/XT1
− − − − −
P124/XT2/
EXCLKS
P124/XT2/
EXCLKS
P125/RESET P125/RESET P125/RESET P125/RESET
(/TI000)
(/INTP0)
P125/RESET P125/RESET P125/RESET
Remark Functions in parentheses ( ) can be assigned by setting the port alternate switch control register (MUXSEL).
P120 functions as an I/O port with an output latch. P120 can be set to the input mode or output mode in 1-bit units
using port mode register 12 (PM12).
P121 to P125 function as an Input port.
When used as an input port for P120 and P125, use of an on-chip pull-up resistor can be specified by pull-up resistor
option register 12 (PU12).
This port can also be used as pins for external interrupt request input, potential input for external low-voltage detection,
connecting resonator for main system clock, connecting resonator for subsystem clock, external clock input for main
system clock, external clock input for subsystem clock, external reset input, and clock input and data I/O for flash memory
programmer/on-chip debugger.
The timer input and external interrupt request input can be assigned to P121 of the 78K0/KA2-L (25-pin products) and
P121 and P125 of the 78K0/KA2-L (32-pin products) by setting the port alternate switch control register (MUXSEL). The
data output of the serial interface can be assigned to P120 of the 78K0/KC2-L (44-pin and 48-pin products) by setting the
port alternate switch control register (MUXSEL).
Set bit 5 (RSTM) of the reset pin mode register (RSTMASK) to 1 when using P125/RESET as an input port, and clear
RSTM to 0 when using P125/RESET as an external reset input.
Reset signal generation sets port 12 to input mode.
Figures 4-27 to 4-29 show block diagrams of port 12.
<R>
<R>