µPD161831
4.1 Serial Interface Operation Specification Register
Table 4−1 shows the function of the serial interface operation specification register.
Table 4−1. Function of Serial Interface Operation Specification Register (A7 to A0)
No.
Bit Name
Function
A7 −
A6 µPD161831/back
panel LCD select
A5 Read/write select
A4 −
A3 −
A2 −
A1 −
A0 Command/data
select
−
This bit specifies whether data D7 to D0 are data for a register of the µPD161831 or data for the
back panel LCD. If D7 to D0 are data for the back panel LCD, the chip select pins for the back
panel LCD (/CS1 = L, CS2 = H) are asserted, and data D7 to D0 are output to SUB_SO along
with the clock output by SCLK_SUB.
0: D7 to D0 are data for a µPD161831 register.
1: D7 to D0 are data for the back panel LCD controller driver.
This bit selects whether the transfer of data D7 to D0 is for a read operation or a write operation.
Note, however, that in a read operation, only the registers of the µPD161831 can be read.
For the timing chart of the read operation, refer to 5. TIMING GENERATOR NON-USE
FUNCTION.
0: D7 to D0 are for a write operation.
1: D7 to D0 are for a read operation.
−
−
−
−
This bit selects whether data D7 to D0 specify the register number of a command register or are
set to a command register.
If an access to the back panel LCD controller driver is selected (A6 = 1), the value of this bit is
reflected on the A0 pin (when A0 = 0: Low output, when A0 = 1: High output).
0: D7 to D0 specify a register number.
1: D7 to D0 are set to a register.
14
Preliminary Product Information S16269EJ2V0PM