Epson RA4803SA, Applications Manual

Page: 27 / 33

RA4803SA
Page - 24 ETM38E-03
8.6. Read/Write of data
For both read and write, first set up chip condition (internally CE="H") to CE="H" , then specify the 4-bits address,
and finally read or write in 8-bits units. Both read and write use MSB-first. In continuous operation, objected
address is auto incremented. Auto incrementing of the address is cyclic, so address "F" is followed by address "0".
8.6.1. Write of data
1) One-shot writing
CLK
C E
D I
D O
Hi-Z
0 0 0 x A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Mode Address N Data N
2) Continuous writing
CLK
C E
D I
D O
Hi-Z
0 0 x A3 A2 A1 A0 D7 D6 D5 D1 D0 D7 D6
1 2 3 4 5 6 7 8 9 10 11
D1 D0 D7 D6 D1 D0 0
Mode Address N
Data N Data N+1 Data N+m
*When writing data, the data needs to be entered in 8-bits units.
If the input of data in 8-bits unit is not completed before CE input falls, the 8-bits data will not be written
properly at the time CE input falls.
8.6.2. Read of data
1) One-shot reading
CLK
C E
D I
D O
Hi-Z
1 0 0 x A3 A2 A1 A0
D7 D6 D5 D4 D3 D2 D1 D0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Mode Address N
Data N
2) Continuous reading
CLK
C E
D I
D O
Hi-Z
1 0 x A3 A2 A1 A0
D7 D6 D5 D1 D0 D7 D6
1 2 3 4 5 6 7 8 9 10 11
D1 D0 D7 D6 D1 D0
0
Mode Address N
Data N Data N+1 Data N+m