NEC PD78F9488 - Manual (Page 353)

CHAPTER 22 ELECTRICAL SPECIFICATIONS ( µ PD789488, 78F9488, 789489, 78F9489)
User’s Manual U15331EJ4V1UD
353
(2) Serial interface 20 (SIO20) (T
A
= –40 to +85 °C, V
DD
= 1.8 to 5.5 V)
(a) 3-wire serial I/O mode (internal clock output)
Parameter Symbol Conditions MIN. TYP. MAX. Unit
V
DD
= 2.7 to 5.5 V 800 ns SCK20 cycle time t
KCY1
V
DD
= 1.8 to 5.5 V 3200 ns
V
DD
= 2.7 to 5.5 V t
KCY1
/2–50 ns SCK20 high-/low-level
width t
KH1
,
t
KL1 V
DD
= 1.8 to 5.5 V t
KCY1
/2–150 ns
V
DD
= 2.7 to 5.5 V 150 ns SI20 setup time
(to SCK20
↑)
t
SIK1
V
DD
= 1.8 to 5.5 V 500 ns
V
DD
= 2.7 to 5.5 V 400 ns SI20 hold time
(from SCK20
↑)
t
KSI1
V
DD
= 1.8 to 5.5 V 600 ns
V
DD
= 2.7 to 5.5 V 0 250 ns Delay time from SCK20 ↓
to SO20 output
t
KSO1
R = 1 k Ω, 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
V
DD
= 2.7 to 5.5 V 800 ns SCK20 cycle time t
KCY2
V
DD
= 1.8 to 5.5 V 3200 ns
V
DD
= 2.7 to 5.5 V 400 ns SCK20 high-/low-level
width t
KH2
,
t
KL2 V
DD
= 1.8 to 5.5 V 1600 ns
V
DD
= 2.7 to 5.5 V 100 ns SI20 setup time
(to SCK20
↑)
t
SIK2
V
DD
= 1.8 to 5.5 V 150 ns
V
DD
= 2.7 to 5.5 V 400 ns SI20 hold time
(from SCK20
↑)
t
KSI2
V
DD
= 1.8 to 5.5 V 600 ns
V
DD
= 2.7 to 5.5 V 0 300 ns Delay time from SCK20 ↓
to SO20 output
t
KSO2
R = 1 k Ω, 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
V
DD
= 2.7 to 5.5 V 78125 bps Transfer rate
V
DD
= 1.8 to 5.5 V 19531 bps