hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 38

• Manufacturer Part Number: hd66765
• Description: 396-channel Segment Driver With Internal Ram For 4096-color Displays - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66765
c) RAM-Data Read-Transfer Timing
(Output)
(Input)
(Input)
(Input)
(Input)
(Input)
(Input)
SCL
(Output)
CS*
SDI
SDO
(Input)
(Input)
(Input)
SCL
CS*
SDI
b) Timing of Consecutive Data-Transfer through Clock-Synchronized Serial Bus Interface
SDO
SCL
CS*
SDI
a) Timing of Basic Data-Transfer through Clock-Synchronized Serial Bus Interface
Transfer start
Start
Start
Figure 29 Procedure for Transfer on Clock-Synchronized Serial Bus Interface
Start byte
1 2 3 4 5 6 7 8
R/W = 1
RS = 1,
"0"
1
Start byte
Device ID code
"1" "1" "1"
Note: Five bytes of the RAM read data after the start byte are invalid. The HD66765 starts
2
3
Dummy
to read the correct RAM data from the sixth byte.
read 1
Start byte
Note: The first byte after the start byte is always the upper eight bits.
4
"0" ID RS
5
6
9 10 1112 13 14
Dummy
RS
Instruction 1: upper
eight bits
read 2
7
RW
R/W
8
MSB
DB
15
DB
15
9 10 11 12 13 14
DB
14
DB
14
Dummy
read 3
15 16
Index register setting, instruction, RAM data write
DB
13
DB
13
Status read, instruction read, RAM data read
38
DB
12
DB
12
1718 19 20
DB
DB
11
11
Instruction 1: lower
eight bits
Dummy
read 4
DB
10
DB
10
DB
DB
9
9
15 16 17 18 19 20
21 22 23 24
DB
DB
8
8
Dummy
read 5
DB
DB
7
7
DB
DB
6
6
Instruction 1: execution
time
DB
DB
25 26 2728 29 30
5
5
RAM read:
Instruction 2: upper
eight bits
eight bits
DB
DB
upper
4
4
DB
DB
3
3
21 22 23 24
DB
DB
2
2
RAM read:
eight bits
DB
DB
1
1
lower
31 32
Transfer end
LSB
DB
DB
0
0
End
End