TL16PNP550A Datasheet, PDF (25/40 Pages) Texas Instruments – ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH PLUG-AND-PLAY (PnP) AND AUTOFLOW CONTROL

ISA Bus
TL16PNP550A
ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH PLUG-AND-PLAY (PnP) AND AUTOFLOW CONTROL
SLLS190B – MARCH 1995 – REVISED MARCH 1996
PRINCIPLES OF OPERATION
SIO
TL16PNP550A ^CS
SCLK
D
Q
S ^EEPROM
C
EEPROM
EEPROM
Interface
Control
(optional)
CPU
NOTE A: It is recommended that a 2-kΩ resistor be connected between D and Q terminals.
Figure 17. TL16PNP550A and EEPROM Interface
EEPROM READ
The TL16PNP550A only supports read transactions. The READ op code instruction (10) must be sent into the
EEPROM. The op code is then followed by an address for the 16-bit word, which is 8-bits long . The READ op
code with accompanying address directs the EEPROM to output serial data on the EEPROM data terminal D/Q
which is connected to the TL16PNP550A bidirectional serial data bus (SIO). Specifically, when a READ op code
and address are received, the instruction and address are decoded and the addressed EEPROM data is
transferred into an output shift register in the EEPROM. Each read transaction consists of a start bit, 2-bit op
code (10), 8-bit address, and 16-bit data. The TL16PNP550A does not accommodate the EEPROM
auto-address next word feature.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
25