
30
Table 1-6
HD404318, HD404358 and HD404358R Series Pin Functions (cont)
Type
Symbol
I/O
Function
Port
R8
0 to R83
I/O
High voltage R8 port (HD404318 Series): High
voltage I/O pins (PMOS open drain) that can be
accessed as a 4-bit unit.
R8 port (HD404358 Series): Standard voltage I/O pins
(CMOS three state) that can be accessed as a 4-bit
unit.
R8 port (HD404358R Series): Standard voltage large
current I/O pins that can be accessed as a 4-bit unit.
Pins R8
0 to R83 are high-current pins (CMOS three
state) capable of handling current levels of up to 15
mA.
RA
1
Input
High voltage RA port (HD404318 Series): Single bit
high voltage input pin.
RA port (HD404358/HD404358R Series): Single bit
standard input pin.
System control
TEST
Input
Test: Connect to ground.
RESET
Input
Reset: The microcomputer goes to the reset state
when a low level is applied to this pin.
STOPC
Input
Stop mode clear: Input pin for clearing stop mode.
The microcomputer switches from stop mode to active
mode when a low level is applied to this pin.
Interrupt
INT
0, INT1
Input
External interrupts 0 and 1: Falling edge detection
external interrupt inputs.
Alarm
BUZZ
Output Alarm output: Output pin for the alarm output.
8-bit timers
TOC
Output Timer C output: The timer C output.
EVNB
Input
Timer B event input: The timer B event input. External
events can be counted on falling edges, rising edges,
or falling/rising edge pairs in this input. This pin can
also be used as an input capture trigger.
Serial interface
SCK
I/O
Serial transfer clock I/O: I/O pin for the serial
interface clock.
SI
Input
Serial reception data input: Data input pin for the
serial interface.
SO
Output Serial transmission output: Data output pin for the
serial interface.
A/D converter
AN
0 to AN7
Input
Analog input channels 0 to 7: Analog input channels
for the A/D converter.
Note: * Apply to the HD404358R Series.