EM78P258N
8-Bit Microprocessor with OTP ROM
5 Pin Descriptions
5.1 EM78P258NP/N Pin Description
Symbol
Pin No. Type
Function
VDD
10
12
–
I
Power supply
■ XTAL type Crystal input terminal or external clock input pin
■ RC type: RC oscillator input pin
OSCI
OSCO
P70
■ XTAL type: Output terminal for crystal oscillator or external
clock input pin
11
I/O
■ RC type:
Clock output with a duration one instruction cycle
■ External clock signal input
■ General-purpose I/O pin
11
I/O
I/O
■ Default value at power-on reset
■ General-purpose I/O pin
■ Open_drain
P60, P61
P66, P67
6 ~ 9
■ Default value at power-on reset
■ General-purpose I/O pin
1 ~ 3
12 ~ 14
■ Pull_high/pull_down
P50 ~ P55
IR OUT
I/O
O
■ Wake up from sleep mode when the status of the pin changes
■ Default value at power-on reset
■ IR mode output pin.
■ Driving current = 10mA when the output voltage drops to
13
Vdd-0.5V at Vdd = 5V
■ Sinking current = 15mA when the output voltage drops to
GND+0.5V at Vdd = 5V
■ External reference voltage for ADC
■ Defined by ADCON (R9)<7>
VREF
/INT
3
6
I
I
■ External interrupt pin triggered by falling or rising edge
■ Defined by CONT <7>
TCC, TCCA,
3, 7,
■ External Counter input
I
I
■ TCC defined by CONT<5>
■ TCCA defined by IOC80 <1>
1, 2,
■ Analog to Digital Converter
ADC0 ~ ADC3
13, 14
■ Defined by ADCON (R9)<1:0>
■ If it remains at logic low, the device will be reset
■ Wake-up from sleep mode when pin status changes
/RESET
VSS
4
5
I
■ Voltage on /RESET/Vpp must not exceed Vdd during normal
mode
–
Ground.
4 •
Product Specification (V1.0) 06.16.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
