EM78458AP datasheet(10/62 Pages) EMC

Part #	EM78458AP

Description	8-Bit Microcontroller with MASK ROM

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Manufacturer	EMC [ELAN Microelectronics Corp]

Direct Link	http://www.emc.com.tw

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EM78458/459

8-Bit Microcontroller with MASK ROM

4

•

Product Specification (V1.4) 05.27.2005

(This specification is subject to change without further notice)

3.2

EM78459 Pin Description

Symbol

Pin No.

Type

Function

VDD

19, 18

-

Power supply.

OSCI

22

I

* XTAL type: Crystal input terminal or external clock input pin.

* RC type: RC oscillator input pin.

OSCO

21

O

* XTAL type: Output terminal for crystal oscillator or external clock input

pin.

* RC type: Clock output with a period of one instruction cycle time, the

prescaler is determined by the CONT register.

* External clock signal input.

P50

14

I

* General-purpose Input only.

* Default value while power-on reset.

P51 ~ P57

15~17

23, 24

1, 2

I/O

* General-purpose I/O pin.

* Default value while power-on reset.

P60 ~ P67

3, 4,

8~13

I/O

* General-purpose I/O pin.

* Default value while power-on reset.

INT

14

I

* External interrupt pin triggered by falling edge.

ADC1~ADC8

3, 4,

8~13

I

* Analog to Digital Converter.

* Defined by AD-CMPCON (IOCA0)<2:4>.

PWM1, PWM2

15, 16

O

* Pulse width modulation outputs.

* Defined by PWMCON (IOC51)<6, 7>

VREF

17

I

* External reference voltage for ADC

* Defined by AD-CMPCON (IOCA0)<7>.

CIN-, CIN+, CO

24, 1, 2

I

* ‘-’ -> the Vin- input pins of the comparators.

* ‘+’ -> the Vin+ input pins of the comparators.

* Pin CO is the output of the comparator.

* Defined by AD-CMPCON (IOCA0) <5, 6>

/RESET

20

I

* If it remains at logic low, the device will be reset.

* Wake up from sleep mode when pins status changes.

* Voltage on /RESET/Vpp must not be over Vdd during normal mode.

* Pull-high is on if /RESET is asserted.

TCC

23

I

* Real time clock/counter with Schmitt trigger input pin; it must be tied to

VDD or VSS if it is not in use.

ENTCC

5

I

1: Enable TCC; 0: Disable TCC.

VSS

6, 7

-

Ground.

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