UPD16434 NEC, UPD16434 Datasheet - Page 11

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

2.2 Command Decoder
2.3 Character Generator
sent from the serial/parallel register to the command decoder for decoding.
directly transferred to the data memory.
contents, and the result is transferred to the data memory. In the character mode, the data loaded into the
serial/parallel register is regarded as ASCII or JIS code and is sent to the character generator. It is decoded to 5
7-bit character display pattern, and is stored into 5 successive data memory addresses.
mode, the serial/parallel interface always reads 8-bit data from the data memory and sets it in the serial/parallel register
for the next read operation.
each /SCK falling edge.
D0 pins at the first falling edge of the /STB, and the lower 4 bits of the data in the serial/parallel register are output from
those pins at the second falling edge of the /STB.
automatically read out from the data memory and set in the serial/parallel register.
clocked in as a command, and is decoded to generate an internal control signal.
executed. In this case, 8-bit data written through the serial/parallel interface is interpreted as a character code, and the
5
the data memory (7 bits
of 20H to 7FH correspond to ASCII characters, and A0H to DFH correspond to JIS characters.
If the C, /D input indicates command specifications, the data input from the CPU to the serial/parallel interface is
Only when set to the read mode, can the serial/parallel interface output data to the CPU. When set to the read
In the write mode, if the C, /D input indicates data specifications, the data loaded to the serial/parallel register is
In the AND or OR mode, the data loaded into the serial/parallel register is ANDed or ORed with the data memory
In the serial interface mode, the data in the serial/parallel register is output from the SO pin with the MSB first at
In the parallel interface mode, the upper 4 bits of the data in the serial/parallel register are output from the D3 to
In either the serial/parallel interface mode, each time 8 bits of data are output, the next 8 bits of data are
If the 8-bit data, input through the serial/parallel interface, is specified as a command (C, /D = 1), the data is
The character generator becomes effective, when a character mode setting command (SCML, SCMR) is
The character generator contains the following 160 different pattern data :
Figure 2–2 shows correspondence of character codes (ASCII/JIS) and 5 dots
7-dot matrix pattern, corresponding to the code, will be generated. It is transferred to the 5 successive addresses in
Upper-case alphabets 26
Lower-case alphabets 26
Numerical characters
Symbols
5 times).
ASCII
10
34
Data Sheet S10299EJ4V0DS00
Symbols
KATAKANA 55
9
JIS
7 dots display patterns. 96 codes
PD16434
11