Table of Contents
Advertisement
(2) Communication format
Read data from each register on the LCD controller/driver starting from the start condition, slave ID, address,
restart condition, slave ID, read data, then stop condition in that order.
Access
target
LCDCTL
LCDSEG
<7>
RST
RST
RST
Note
The address is incremented by one based on the register read/write start address by continuously
performing read/write access from transmissions of the start condition to stop condition. With this function,
the address does not need to be set each time.
Cautions 1. Generate a stop condition if an access like the one shown below is made.
2. When SDA is fixed at the low level output status due to noise, input a reset signal.
Remark
ST:
RST:
SP:
A7 to A0: Addresses for LCDCTL or LCDSEG
58
Downloaded from
Elcodis.com
electronic components distributor
CHAPTER 4 I
Figure 4-12. Communication Format for Read Operation (When Reading Twice)
<1>
<2>
ST
Slave ID
ST
0 1 1 1 0 0 0
ST
0 1 1 1 0 0 1
<8>
Slave ID
0 1 1 1 0 0 0
0 1 1 1 0 0 1
• An access made in a format other than specified
• An access made with a slave ID other than specified
Start condition
Restart condition
Stop condition
2
C COMMUNICATIONS
<3>
<4>
R/W
ACK
0
ACK
A7
A6
0
ACK
A7
A6
<9>
<10>
R/W
ACK
1
ACK
D7
D6
1
ACK
D7
D6
Address
LCDCTL : A7, A6, A5, A4, A3, A2, A1, A0
LCDSEG : A7, A6, A5, A4, A3, A2, A1, A0
<13>
Read data2
D7
D6
D5
D4
D7
D6
D5
D4
Note
Address
LCDCTL : (A7, A6, A5, A4, A3, A2, A1, A0) + 1
LCDSEG : (A7, A6, A5, A4, A3, A2, A1, A0) + 1
User's Manual U18438EJ2V0UD
<5>
Address
A5
A4
A3
A2
A1
A0
A5
A4
A3
A2
A1
A0
<11>
Read dara 1
D5
D4
D3
D2
D1
D0
D5
D4
D3
D2
D1
D0
<14>
ACK
D3
D2
D1
D0
NACK
D3
D2
D1
D0
NACK
<6>
ACK
ACK
ACK
<12>
ACK
ACK
ACK
<15>
SP
SP
SP
Advertisement
Table of Contents
