ELAN Home Systems EM78P458 - Manual (Page 7)

EM78P458/459
OTP ROM
PWM2 * Defined by PWMCON (IOC51)<6, 7>
VREF 15 I
* External reference voltage for ADC
* Defined by AD-CMPCON (IOCA0)<7>.
CIN-, CIN+,
CO
20, 1,2
I
O
* “-“ -> 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>
TCC 19 I
* Real time clock/counter with Schmitt trigger input pin; it must be tied to
VDD or VSS if it is not in use.
VSS 5 - Ground.
Table 2 EM78P459 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.
This specification is subject to change without prior notice. 07.01.2003 (V1.3) 7