參數(shù)資料
型號(hào)： UPD784021GK-BE9
廠商： NEC Corp.
英文描述： 16/8-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 16/8-BIT單片機(jī)
文件頁(yè)數(shù)： 41/90頁(yè)
文件大?。?/td> 614K
代理商： UPD784021GK-BE9
41
m
PD784020, 784021
(1) Three-wire serial I/O mode
This mode is designed for communication with a device incorporating a conventional synchronous serial interface.
Basically, three lines are used for communication: the serial clock line (SCK0) and serial data lines (SI0 and SO0).
In general, a handshake line is required to check the state of communication.
(2) SBI mode
The SBI mode allows communication with more than one device via two lines: the serial clock (SCK0) and serial
bus (SB0). The SBI mode is the standard NEC serial interface.
A master device outputs an address through the SB0 pin to select a slave device with which communication is
to be performed. After a target device is selected, commands and data are transmitted between the master device
and slave device.
8.9 EDGE DETECTION FUNCTION
The interrupt input pins (NMI, INTP0-INTP5) are used to apply not only interrupt requests but also trigger signals
for the built-in circuits. As these pins are triggered by an edge (rising or falling) of an input signal, a function for edge
detection is incorporated. Moreover, a noise suppression function is provided to prevent erroneous edge detection
caused by noise.
Note
INTP0 is used for sampling clock selection.
Pin
Detectable edge
Noise suppression method
NMI
Rising edge or falling edge
Analog delay
INTP0-INTP3
Rising edge or falling edge, or both edges
Clock sampling
Note
INTP4, INTP5
Analog delay
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