EM78458/459
8-Bit Microcontroller with MASK ROM
3 PIN ASSIGNMENT
P56/CIN+
P57/CO
1
24
23
22
21
20
19
18
17
16
15
14
13
P55/CIN-
P54/TCC
OSCI
2
P60/ADC1
P61/ADC2
ENTCC
3
20
19
18
17
16
15
14
13
12
11
P55/CIN-
P54/TCC
OSCI
P56/CIN+
P57/CO
1
4
OSCO
2
5
RESET
3
P60/ADC1
P61/ADC2
VSS
VSS
6
VDD
4
OSCO
VSS
7
VDD
5
VDD
P62/ADC3
P63/ADC4
P64/ADC5
P65/ADC6
P66/ADC7
8
P53/VREF
P52/PWM2
P51/PWM1
P50/INT
P67/ADC8
6
P53/VREF
P52/PWM2
P51/PWM1
P50/INT
P67/ADC8
P62/ADC3
P63/ADC4
P64/ADC5
P65/ADC6
P66/ADC7
9
7
10
11
12
8
9
10
Fig. 1 Pin Assignment
3.1 EM78458 Pin Description
Symbol
VDD
Pin No. Type
Function
16
18
-
I
Power supply.
* XTAL type: Crystal input terminal or external clock input pin.
* RC type: RC oscillator input pin.
OSCI
*XTAL type: Output terminal for crystal oscillator or external clock input
pin.
OSCO
17
12
O
*RC type: Clock output with a period of one instruction cycle time, the
prescaler is determined by the CONT register.
* External clock signal input.
* General-purpose Input only.
* Default value while power-on reset.
P50
I
13~15
19, 20,
1, 2
* General-purpose I/O pin.
* Default value while power-on reset.
P51 ~ P57
I/O
3, 4,
6~11
12
3, 4,
* General-purpose I/O pin.
P60 ~ P67
INT
I/O
* Default value while power-on reset.
* External interrupt pin triggered by falling edge.
* Analog to Digital Converter.
I
I
ADC1~ADC8
6 ~ 11
* Defined by AD-CMPCON (IOCA0)<2:4>.
* Pulse width modulation outputs.
PWM1, PWM2
VREF
13, 14
15
O
I
* Defined by PWMCON (IOC51)<6, 7>
* External reference voltage for ADC
* Defined by AD-CMPCON (IOCA0)<7>.
* “-“ -> the input pin of Vin- of the comparator.
* “+”-> the input pin of Vin+ of the comparator.
* Pin CO is the output of the comparator.
* Defined by AD-CMPCON (IOCA0) <5, 6>
* Real time clock/counter with Schmitt trigger input pin; it must be tied to
VDD or VSS if it is not in use.
I
O
CIN-, CIN+, CO 20, 1,2
TCC
VSS
19
5
I
-
Ground.
Product Specification (V1.4) 05.27.2005
• 3
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
