ST16C654 EXAR [Exar Corporation], ST16C654 Datasheet - Page 10

• Manufacturer Part Number: ST16C654
• Description: 2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

   
The RESET input resets the internal registers and the serial interface outputs in both channels to their default
state (see
function in the device. Following a power-on reset or an external reset, the 654 is software compatible with
previous generation of UARTs, 16C454 and 16C554.
During Motorola Bus Mode (16/68# pin is connected to GND), the package interface pins are configured for
connection with Motorola, and other popular microprocessor bus types. In this mode the 654 decodes two
additional addresses, A3 and A4, to select one of the four UART ports. The A3 and A4 address decode
function is used only when in the Motorola Bus Mode.
2.2
2.3
Device Reset
Channel Selection
Table
16). An active high pulse of longer than 40 ns duration will be required to activate the reset
CSA
CS#
#
1
0
1
1
1
0
1
0
0
0
0
T
T
ABLE
ABLE
CSB
N/A
A4
#
1
1
0
1
1
0
0
0
1
1
1: C
2: C
CSC
N/A
A3
#
1
1
1
0
1
0
0
1
0
1
HANNEL
HANNEL
CSD
#
1
1
1
1
0
0
A-D S
A-D S
10
See Table
Channel A selected
Channel B selected
Channel C selected
Channel D selected
UART de-selected
Channels A-D selected
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
Channel A selected
Channel B selected
Channel C selected
Channel D selected
ELECT IN
ELECT IN
UART de-selected
F
UNCTION
F
UNCTION
2.
16 M
68 M
ODE
ODE
ST16C654/654D
REV. 5.0.0