XR16L651CM EXAR [Exar Corporation], XR16L651CM Datasheet - Page 12

• Manufacturer Part Number: XR16L651CM
• Description: 2.25V TO 5.5V UART WITH 32-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

XR16L651
2.25V TO 5.5V UART WITH 32-BYTE FIFO
The output function of interrupt, INT, output changes according to the operating bus type and various factors.
Table 3
OR’ed. This is accomplished by setting MCR bit-5 to a logic 1 and connecting a 1K to 10K resistor between
this pin and ground to provide an acceptable logic 0 level.
2.6
Intel Bus Mode
Motorola Bus Mode
PC Mode
M
IM# I
OTOROLA
(I
NTEL
0
0
1
1
0
0
0
0
NPUT
summarizes its behavior in Intel, Motorola and PC mode of operation. Multiple interrupts can be wire-
Interrupt
/
)
PCMODE#
I
NPUT
1
1
1
1
0
0
0
0
T
ABLE
don’t care
don’t care
don’t care
don’t care
S3 I
3: I
0
1
1
1
NPUT
NTERRUPT
MCR
don’t care
don’t care
(INT
SELECT
0
1
1
O
0
0
1
TYPE
BIT
UTPUT
)
-5
MCR
don’t care
don’t care
don’t care
don’t care
don’t care
(INT, INT#
ENABLE
12
(IRQ
0
1
1
BIT
N
-3
)
AND
INT is logic 0 for inactive interrupt.
INT is logic 1 for active interrupt (active high)
INT is three-state for inactive interrupt
INT is logic 1 for active interrupt (open source).
Requires a 1K-10K
INT# is logic 0 for active interrupt (active low, open
drain). Requires a 1K-10K
INT# is three-state.
IRQA is three-state. Either IRQB or IRQC is used,
see
IRQA is three-state.
IRQA is logic 0 for inactive interrupt.
IRQA is logic 1 for active interrupt (active high).
IRQA is three-state for no interrupt.
IRQA is logic 1 for active interrupt (active high,
open source).
INT# is three-state for inactive interrupt.
Table
IRQA) F
I
NTERRUPT
1.
UNCTIONS
O
UTPUT
resistor to GND.
(INT, INT#
resistor to VCC.
áç
áç
áç
áç
OR
IRQA)
REV. 1.3.0