UPD78F9177 Datasheet, PDF (33/56 Pages) NEC – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78F9177, 78F9177Y
(2) Serial interface (TA = −40 to +85 °C, VDD = 1.8 to 5.5 V)
(a) 3-wire serial I/O mode (SCK20...Internal clock)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
SCK20 cycle time
tKCY1 VDD = 2.7 to 5.5 V
800
ns
3200
ns
SCK20 high-/low-
level width
tKH1, tKL1 VDD = 2.7 to 5.5 V
SI20 setup time
(to SCK20 ↑)
tSIK1 VDD = 2.7 to 5.5 V
tKCY1/2−50
ns
tKCY1/2−150
ns
150
ns
500
ns
SI20 hold time
(from SCK20 ↑)
tKSI1 VDD = 2.7 to 5.5 V
400
ns
600
ns
SO20 output delay
time from SCK20↓
tKSO1
R = 1 kΩ,
Note
C = 100 pF
VDD = 2.7 to 5.5 V
0
0
250
ns
1000
ns
Note R and C are the load resistance and load capacitance of the SO20 output line.
(b) 3-wire serial I/O mode (SCK20...External clock)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
SCK20 cycle time
tKCY2 VDD = 2.7 to 5.5 V
900
ns
3500
ns
SCK20 high-/low-
level width
tKH2, tKL2 VDD = 2.7 to 5.5 V
SI20 setup time
(to SCK20 ↑)
tSIK2 VDD = 2.7 to 5.5 V
400
ns
1600
ns
100
ns
150
ns
SI20 hold time
(from SCK20 ↑)
tKSI2 VDD = 2.7 to 5.5 V
400
ns
600
ns
SO20 output delay
time from SCK20 ↓
tKSO2
R = 1 kΩ,
Note
C = 100 pF
VDD = 2.7 to 5.5 V
0
0
300
ns
1000
ns
SO20 setup time
tKAS2 VDD = 2.7 to 5.5 V
(when using SS20,
to SS20 ↓)
120
ns
400
ns
SO20 disable time
(when using SS20,
from SS20 ↑)
tKDS2
VDD = 2.7 to 5.5 V
240
ns
800
ns
Note R and C are the load resistance and load capacitance of the SO20 output line.
(c) UART mode (dedicated baud rate generator output)
Parameter
Transfer rate
Symbol
Conditions
VDD = 2.7 to 5.5 V
MIN.
TYP.
MAX.
Unit
78125
bps
19531
bps
Data Sheet U14022EJ1V0DS00
33