Electronics America Single-Chip Microcontrollers User's Manual

CHAPTER 22 ELECTRICAL SPECIFICATIONS ( µ PD789488, 78F9488, 789489, 78F9489)
User’s Manual U15331EJ4V1UD 353
(2) Serial interface 20 (SIO20) (TA = –40 to +85°C, VDD = 1.8 to 5.5 V)
(a) 3-wire serial I/O mode (internal clock output)
Parameter Symbol Conditions MIN. TYP. MAX. Unit
VDD = 2.7 to 5.5 V 800 ns SCK20 cycle time tKCY1
V
DD = 1.8 to 5.5 V 3200 ns
VDD = 2.7 to 5.5 V
tKCY1/2–50
ns SCK20 high-/low-level
width
tKH1,
t
KL1
V
DD = 1.8 to 5.5 V
tKCY1/2–150
ns
VDD = 2.7 to 5.5 V 150 ns SI20 setup time
(to SCK20↑)
tSIK1
V
DD = 1.8 to 5.5 V 500 ns
VDD = 2.7 to 5.5 V 400 ns SI20 hold time
(from SCK20↑)
tKSI1
V
DD = 1.8 to 5.5 V 600 ns
VDD = 2.7 to 5.5 V 0 250 ns Delay time from SCK20↓
to SO20 output
tKSO1 R = 1 kΩ, C = 100 pF
Note
V
DD = 1.8 to 5.5 V 0 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 (external clock input)
Parameter Symbol Conditions MIN. TYP. MAX. Unit
VDD = 2.7 to 5.5 V 800 ns SCK20 cycle time tKCY2
V
DD = 1.8 to 5.5 V 3200 ns
VDD = 2.7 to 5.5 V 400 ns SCK20 high-/low-level
width
tKH2,
t
KL2
V
DD = 1.8 to 5.5 V 1600 ns
VDD = 2.7 to 5.5 V 100 ns SI20 setup time
(to SCK20↑)
tSIK2
V
DD = 1.8 to 5.5 V 150 ns
VDD = 2.7 to 5.5 V 400 ns SI20 hold time
(from SCK20↑)
tKSI2
V
DD = 1.8 to 5.5 V 600 ns
VDD = 2.7 to 5.5 V 0 300 ns Delay time from SCK20↓
to SO20 output
tKSO2 R = 1 kΩ, C = 100 pF
Note
V
DD = 1.8 to 5.5 V 0 1000 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 Symbol Conditions MIN. TYP. MAX. Unit
VDD = 2.7 to 5.5 V 78125 bps Transfer rate
V
DD = 1.8 to 5.5 V 19531 bps