參數(shù)資料
型號(hào)： UPD7228A
廠商： NEC Corp.
英文描述： 1/8, 1/16 DUTY LCD CONTROLLER/DRIVER
中文描述： 1 / 8，1 / 16稅LCD控制器/驅(qū)動(dòng)
文件頁(yè)數(shù)： 11/64頁(yè)
文件大?。?/td> 314K
代理商： UPD7228A
Data Sheet S10299EJ4V0DS00
11
μ
PD16434
If the C, /D input indicates command specifications, the data input from the CPU to the serial/parallel interface is
sent from the serial/parallel register to the command decoder for decoding.
In the write mode, if the C, /D input indicates data specifications, the data loaded to the serial/parallel register is
directly transferred to the data memory.
In the AND or OR mode, the data loaded into the serial/parallel register is ANDed or ORed with 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.
Only when set to the read mode, can the serial/parallel interface output data to the CPU. When set to the read
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.
In the serial interface mode, the data in the serial/parallel register is output from the SO pin with the MSB first at
each /SCK falling edge.
In the parallel interface mode, the upper 4 bits of the data in the serial/parallel register are output from the D3 to
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.
In either the serial/parallel interface mode, each time 8 bits of data are output, the next 8 bits of data are
automatically read out from the data memory and set in the serial/parallel register.
2.2 Command Decoder
If the 8-bit data, input through the serial/parallel interface, is specified as a command (C, /D = 1), the data is
clocked in as a command, and is decoded to generate an internal control signal.
2.3 Character Generator
The character generator becomes effective, when a character mode setting command (SCML, SCMR) is
executed. In this case, 8-bit data written through the serial/parallel interface is interpreted as a character code, and the
5
×
7-dot matrix pattern, corresponding to the code, will be generated. It is transferred to the 5 successive addresses in
the data memory (7 bits
×
5 times).
The character generator contains the following 160 different pattern data :
ASCII
JIS
Upper-case alphabets 26
KATAKANA 55
Lower-case alphabets 26
Symbols 9
Numerical characters 10
Symbols 34
Figure 2–2 shows correspondence of character codes (ASCII/JIS) and 5 dots
×
7 dots display patterns. 96 codes
of 20H to 7FH correspond to ASCII characters, and A0H to DFH correspond to JIS characters.
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