xr16m680 Exar Corporation, xr16m680 Datasheet - Page 8

• Manufacturer Part Number: xr16m680
• Description: 1.62v To 3.63v High Performance Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

XR16M680
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The M680 data interface supports the Intel and Motorola compatible types of CPUs. No
clock (oscillator nor external clock) is required for a data bus transaction. Each bus cycle is asynchronous
using CS#, IOR# and IOW# or R/W# inputs. A typical data bus interconnection for Intel and Motorola mode is
shown in
F
2.0 FUNCTIONAL DESCRIPTIONS
2.1
IGURE
4. XR16M680 T
CPU Interface
Figure
UART_RESET
UART_RESET#
POWERSAVE
POWERSAVE
UART_CS#
UART_IRQ#
UART_CS#
UART_INT
4.
IOW#
IOR#
R/W#
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
YPICAL
I
NTEL
/M
OTOROLA
vcc
Motorola Data Bus Interconnections
Intel Data Bus Interconnections
D
ATA
VCC
8
B
US
IOR#
IOW#
PwrSave
CS#
D0
D1
D2
D3
D4
D5
D6
D7
INT
RESET
A0
A1
A2
IOR#
IOW#
INT
PwrSave
D0
D1
D2
D3
D4
D5
D6
D7
RESET
CS#
I
A0
A1
A2
NTERCONNECTIONS
16/68#
16/68#
DTR#
DSR#
RTS#
CTS#
GND
DSR#
DTR#
RTS#
CTS#
GND
CD#
VCC
CD#
VCC
RI#
TX
RX
RI#
TX
RX
VCC
Serial Transceivers of
VCC
Serial Transceivers of
Or Infrared
Or Infrared
RS-232
RS-485
RS-422
RS-232
RS-485
RS-422
REV. 1.0.0