73K222AU Ver la hoja de datos (PDF) - TDK Corporation
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73K222AU Datasheet PDF : 40 Pages
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73K222AU
Single-Chip Modem
with UART
UART INTERFACE
NAME
UA2-UA0
UA3
UDO-UD7
DISTR
DOSTR
CS@
INTRPT
RXD
DIP
37-39
12
27-34
35
36
1
5
6
PLCC
41-43
14
30-37
38
39
2
7
8
TYPE
I
I
I/O
I
I
I
O
I/O
DESCRIPTION
UART Address. These pins determine which of the UART
registers is being selected during a read or write on the UART
data bus. The contents of the DLAB bit in the UART’s Line
Control Register also control which register is referenced. In
single-port mode, UA0-UA3 are latched when ADS goes high.
In dual-port, only UA0-UA2 are used.
(3 state) UART Data. Data or control information to the UART
registers is carried over these lines.
Data Input Strobe. A low on this pin requests a read of the
internal UART registers. Data is output on the D0-D7 lines if
DISTR and CS@ are active.
Data Output Strobe. A low on this pin requests a write of the
internal UART registers. Data on the D0-D7 lines are latched on
the rising edge of DOSTR. Data is only written if both DOSTR
and CS@ are active.
Chip Select. A low on this pin allows a read or write to the
UART registers to occur. In single port mode, CS@ is latched
on ADS.
(3 state) UART Interrupt. This signal indicates that an interrupt
condition on the UART side has occurred. If the Enable 8250A
interrupt bit in the interrupt Enable Register is 0 the interrupt is
gated by the DISTR signal to provide compatibility with the
8250B. The output can be put in a high impedance state with
the OUT2 register bit in the Modem Control Register. In single-
port mode, INTRPT also becomes valid when a modem
interrupt signal is generated by the modem section’s Detect
Register.
Function is determined by STNDLN pin and bit 7, Tone Control
Register:
STNDLN D7
0
0 RXD outputs data received by modem.
1
0 RXD is electrically an input but signal is
ignored.
X
1 RXD is a serial input to UART.
5
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