UPD16488AP NEC [NEC], UPD16488AP Datasheet - Page 15

• Manufacturer Part Number: UPD16488AP
• Description: 1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
• Manufacturer: NEC [NEC]

5. DESCRIPTION OF FUNCTIONS
5.1
5.1.1 Selection of interface type
polarity of the PSX pin as either H (high) or L (low) selects between 8-bit parallel or serial data input, as shown in the
following table.
5.1.2 Parallel interface
to an i80 series or M68 series CPU (see table below).
following table.
The PD16488A chip transfers data using an 8-bit bidirectional data bus (D
When the parallel interface has been selected (PSX = H), setting the C86 pin as either H or L enables a direct connection
The data bus signal is identified according to the combination of the RS, /RD(E), and /WR(R,/W) signals, as shown in the
Notes 1. Fixed as either High or Low.
H: Parallel input
L: Serial input
H: M68 series CPU
L: i80 series CPU
Common
RS
CPU Interface
1
1
0
0
PSX
2. Hi-Z: High impedance
C86
R,/W
M68
1
0
1
0
CS
CS
CS
/RD
/CS1
/CS1
/CS1
0
1
0
1
RS
RS
RS
i80
/WR
Note1 Note1 Note1
1
0
1
0
/RD
/RD
CS2
CS2
CS2
Reads display data and registers
Writes display data and registers
Prohibited
Writes to index register
/WR
/WR
Data Sheet S15745EJ2V0DS
RS
RS
RS
C86
C86
D
D
SI
/RD
/RD
Function
7
7
E
SCL
D
D
6
6
R,/W
/WR
/WR
Hi-Z
D
D
5
5
7
to D0
to D0
to D
Note2
D
D
D
0
) or a serial data input (SI). Setting the
7
7
7
to D
to D
to D
0
0
0
PD16488A
15