LC87F5NC8A Datasheet, PDF (21/25 Pages) Sanyo Semicon Device – CMOS IC FROM 128K byte, RAM 4096 byte on-chip 8-bit 1-chip Microcontroller

LC87F5NC8A
UART (Full Duplex) Operating Conditions at Ta = -40°C to +85°C, VSS1 = VSS2 = VSS3 = VSS4 = 0V
Parameter
Transfer rate
Symbol
UBR, UBR2
Pins/Remarks
UTX1(P32),
Conditions
VDD[V]
min
Specification
typ
max
unit
RTX1(P33),
UTX2(P33),
2.5 to 5.5
16/3
8192/3 tCYC
RTX2(P34)
Data length : 7/8/9 bits (LSB first)
Stop bits : 1-bit (2-bit in continuous data transmission)
Parity bits : None
Example of Continuous 8-bit Data Transmission Mode Processing (First Transmit Data = 55H)
Start of
transmission
Start bit
Transmit data (LSB first)
Stop bit
End of
transmission
UBR
UBR2
Example of Continuous 8-bit Data Reception Mode Processing (First Receive Data = 55H)
Start bit
Start of
reception
Receive data (LSB first)
Stop bit
End of
reception
UBR
UBR2
VDD1, VSS1 Terminal Condition
It is necessary to place capacitors between VDD1 and VSS1 as describe below.
• Place capacitors as close to VDD1 and VSS1 as possible.
• Place capacitors so that the length of each terminal to the each leg of the capacitor be equal (L1 = L1’, L2 = L2’).
• Place high capacitance capacitor C1 and low capacitance capacitor C2 in parallel.
• Capacitance of C2 must be more than 0.1µF.
• Use thicker pattern for VDD1 and VSS1.
L2
L1
VSS1
C1
C2
L1’
L2’
VDD1
No.A0929-21/25