SED1520D0A Datasheet, PDF (16/52 Pages) List of Unclassifed Manufacturers – DOT MATRIX LCD DRIVER

2.3.12 – 2.3.12
2.0 Block Diagrams
2.3.12 Reset Circuit
This circuit senses the leading edge or trailing edge of RES and initializes the system when its
power is switched on.
Initialization:
(a) Display off
(b) Display start line register: First line
(c) Static drive off
(d) Column address counter: Address 0
(e) Page address register: Page 0
(f) Select duty: 1/32
(g) Select ADC: Forward (ADC command D0 = “0”, ADC status flag = “1”)
(h) Read modify write off
The input at pin RES is level-sensed to select an MPU interface mode as shown in Table 1. For
interfacing with an 80 family MPU, an “H” active reset signal is input to pin RES. For interfacing
with a 68 family MPU, an “L” active reset signal is input to the pin. (See Fig. 7.)?????
As exemplified in section 6 “MPU Interface”, pin RES is connected to the MPU reset pin. Thus the
SED1520 and the MPU are initialized at the same time. If system is initialized by pin RES at power-
on, it may no longer be reset.
The Reset command causes initialization (b), (d) and (e).
16 S-MOS Systems, Inc. • 150 River Oaks Parkway • San Jose, CA 95134 • Tel: [phone] • Fax: [phone]