UPD16434 NEC, UPD16434 Datasheet - Page 10

• Manufacturer Part Number: UPD16434
• Description: 1/8/ 1/16 DUTY LCD CONTROLLER/DRIVER
• Manufacturer: NEC

2. INTERNAL BLOCK FUNCTIONS
10
2.1 Serial/Parallel Interface
interface is used is determined by whether the P, /S input is high (specifying the parallel interface) or low
(specifying the serial interface) at the RESET signal falling edge.
RESET is input, the data processing mode is initialized to the write mode, so that the first command input can be
accepted. Afterwards, the mode can be set to write related or read related data processing mode by the data
processing set command.
interface is set to the data input mode, and the
to D0 pins (4-bit parallel data) in synchronization with the rising edge of the /SCK or the /STB, respectively.
and outputs data from the SO pin (serial data) or from the D3 to D0 pins (4-bit parallel data) in synchronization with the
falling edge of the /SCK or the /STB.
through the serial input/output (SI, SO) or parallel input/output (D3 to D0) and 8-bit parallel data of the data memory.
The
The interface circuit is used to write commands and data from the CPU or output data to the CPU.
The operation of the serial/parallel interface differs, depending on the data processing mode setting. When a
If the data processing mode is set to the write, AND, OR, or the character write related mode, the serial/parallel
If the data processing mode is set to the read mode, the serial/parallel interface becomes the data output mode
The serial/parallel register serves as the buffer, between 8-bit serial data or two 4-bit parallel data transferred
PD16434 contains both serial and parallel interface functions. Whether the serial interface or the parallel
/STB, /SCK
CA0,CA1
D1(P, /S)
D2(CAE)
RESET
/BUSY
D3/SO
D0/SI
C, /D
/CS
Read/write
control
Data
control
Figure 2–1. Serial/Parallel Interface
Data Sheet S10299EJ4V0DS00
PD16434 clocks in the data from the SI pin (serial data) or from the D3
/STB'
/SCK'
SI'
Internal bus
bit 0-3
8-bit serial/parallel register
4
8
bit 4-7
4
SO'
PD16434