參數(shù)資料
型號(hào)： EM78P451S
廠商： ELAN Microelctronics Corp .
英文描述： Quad, Serial, 8-Bit DACs with Rail-to-Rail Outputs
中文描述： 8位微控制器的OTP ROM的
文件頁(yè)數(shù)： 7/54頁(yè)
文件大?。?/td> 421K
代理商： EM78P451S
EM78P451S
8-Bit Microcontroller with OTP ROM
Product Specification (V1.0) 06.01.2004
(This specification is subject to change without further notice)
3
Table 1 Pin description
Symbol
Pin No.
Type
Function Description
R-OSCI
39
I
In XTAL mode: Crystal input; In internal C, external R mode: 56Kohm
±
5% pull
high for 1.8432MHz.
OSCO
40
O
In XTAL mode: Crystal output; In RC mode: Instruction clock output.
P90~P95
5~10
I/O
General bi-directional I/O port. All of its pins can be pulled-high by software.
P90 and P91 are pin-change wake up pins.
General bi-directional I/O port. All of its pins can be pulled-high by software.
P80 and P81 are also used as the R-option pins.
LED direct-driving pin with internal serial resistor used as output and is
software defined.
LED direct-driving pin with internal serial resistor used as output and is
software defined.
Code option bit 3 (REN): reset enable
REN=0 => for reset pin
REN=1 => for general purpose I/O (P70)
Internal pull high resistor 220Kohm
By connecting P74 and P76 together.
P74 can be pulled-high by software and it is also a pin-change wake up pin.
P76 can be defined as an open-drain output.
By connecting P75 and P77 together.
P75 can be pulled-high by software and it is also a pin-change wake up pin.
P77 can be defined as an open-drain output.
General bi-directional port. All of its pins can be pulled-high by software, and
pin-change wake up pins.
General bi-directional I/O port. All of its pins can be pulled-high individually by
software.
P80~P87
19~26
I/O
P70~P72
37~35
I/O
P70/
RESET
37
I/O
CLK
4
I/O
DATA
3
I/O
P60~P67
27~34
I/O
P50~P57
11~18
I/O
VDD
38
-
Power supply pin.
VSS
1
-
Ground pin.
/INT
2
I
An interrupt schmitt-triggered pin.
The function of interrupt triggers at the falling edge.
Users can enable it by software.
SDI
7
I/O
Serial data in for SPI
SDO
8
I/O
Serial data out for SPI.
SCK
9
I/O
Serial clock for SPI.
/SS
10
I/O
/Slave select for SPI.
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