UPD784020 Datasheet, PDF (68/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCOMPUTER

mPD784020, 784021
SERIAL OPERATION (CSI)
Parameter
Serial clock cycle time
(SCK0)
Serial clock low-level width
(SCK0)
Serial clock high-level width
(SCK0)
SI0, SB0 setup time
(referred to SCK0•)
SI0, SB0 hold time
(referred to SCK0•)
SO0, SB0 output delay time
(referred to SCK0Ø)
SO0, SB0 output hold time
(referred to SCK0•)
SB0 high hold time
(referred to SCK0•)
SB0 low setup time
(referred to SCK0Ø)
SB0 low-level width
SB0 high-level width
Symbol
tCYSK0 Input
Conditions
VDD = +5.0 V ±10 %
tWSKL0
Output
Input
VDD = +5.0 V ±10 %
tWSKH0
Output
Input
VDD = +5.0 V ±10 %
tSSSK0
Output
tHSSK0
tDSBSK1 CMOS push-pull output
(three-wire serial I/O mode)
tDSBSK2 Open-drain output
(SBI mode), RL = 1 kW
tHSBSK1 During data transfer
tHSBSK2 SBI mode
tSSBSK
tWSBL
tWSBH
Min.
Max.
Unit
500
ns
1000
ns
T
ns
210
ns
460
ns
0.5T – 40
ns
210
ns
460
ns
0.5T – 40
ns
80
ns
80
ns
0
150
ns
0
400
ns
0.5TCYSK0 – 40
ns
4
tCYX
4
tCYX
4
tCYX
4
tCYX
Remarks 1. The values listed in the above table are obtained when fXX = 25 MHz and CL = 100 pF.
2. tCYX = 1/fXX
3. T: Serial clock frequency specified using software. The minimum value is 16/fXX.
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