EM78P458/459
OTP ROM
* “-“ -> the input pin of Vin- of the comparator.
CIN-, CIN+,
CO
I
* “+”-> 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.
20, 1,2
O
TCC
VSS
19
5
I
-
Ground.
Table 2 EM78P459 Pin Description
Symbol Pin No. Type
VDD
Function
19, 18
22
-
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
21
14
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.
P50
I
* Default value while power-on reset.
15~17
23, 24
1, 2
3, 4,
8~13
14
3, 4,
8~13
* General-purpose I/O pin.
P51 ~ P57
I/O
* Default value while power-on reset.
* General-purpose I/O pin.
P60 ~ P67
INT
I/O
* Default value while power-on reset.
I
I
* External interrupt pin triggered by falling edge.
* Analog to Digital Converter.
ADC1~ADC8
* Defined by AD-CMPCON (IOCA0)<2:4>.
* Pulse width modulation outputs.
PWM1,
PWM2
15, 16
O
I
* Defined by PWMCON (IOC51)<6, 7>
* External reference voltage for ADC
VREF
17
* Defined by AD-CMPCON (IOCA0)<7>.
* ‘-’ -> 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>
* 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.
* Real time clock/counter with Schmitt trigger input pin; it must be tied to
VDD or VSS if it is not in use.
CIN-, CIN+,
CO
24, 1, 2
I
/RESET
TCC
20
23
I
I
ENTCC
VSS
5
6, 7
I
-
1: Enable TCC; 0: Disable TCC.
Ground.
This specification is subject to change without prior notice.
7
06.25.2004 (V1.4)
ELAN [ ELAN MICROELECTRONICS CORP ]
