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TL16PC564BLVI Datasheet(PDF) 7 Page - Texas Instruments

No. de pieza TL16PC564BLVI
Descripción Electrónicos  PCMCIA UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TL16PC564BLVI Datasheet(HTML) 7 Page - Texas Instruments

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TL16PC564BLVI
PCMCIA UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER
SLLS627− SEPTEMBER 2004
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
INTER-
I/O
DESCRIPTION
NAME
PZ NO.
INTER-
FACE†
I/O
DESCRIPTION
WE
89
H
I
Write enable. WE is an active-low input signal used for strobing attribute-memory write data into
the card. This signal has an internal pullup resistor
WR(R/W)
31
S
I
Write or read/write enable. WR(R/W) is the active-low write enable in the Intel mode and read/write
in the Zilog mode.
XIN
42
M
I
Crystal input. XIN is a clock input divided internally based on the PGMCLK register value, then
used as the primary UART clock input.
VTEST
2
M
I
VTEST is an active-high production test input with an internal pulldown resistor. It can be left open
or tied to ground.
† Host = H, Subsystem = S, UART = U, Miscellaneous = M
detailed description
reset-validation circuit
A reset-validation circuit has been implemented to qualify the active-high RESET input. At power up, the level
on the RST output is unknown. Whenever RESET is stable for at least eight ARBCLKIs, RST reflects the
inverted state of that stable value of RESET. Any changes on RESET must be valid for eight ARBCLKI clocks
before the change is reflected on RST. This 8-clock filter provides needed hysteresis on the master reset input.
RST is driven by a low-noise, open-drain, fail-safe output buffer.
host CPU memory map
The host CPU attribute memory space is mapped as follows:
Host CPU Address Bits 9−1 (HA0 = 0)
Attribute Memory Space
0 − 255
CIS
256
CCR0
257
CCR1
258
CCR2
259
CCR3
260
CCR4
261
CCR5
262
CCR6
263
CCR7
The host CPU I/O space is mapped as follows:
Address Mode (hex)
Normal Mode
COM1
COM2
COM3
COM4
I/O Space
0 (DLAB = 0)
3F8
2F8
3E8
2E8
UART receiver buffer register (RBR) − read only
0 (DLAB = 0)
3F8
2F8
3E8
2E8
UART transmitter holding register (THR) − write only
0 (DLAB = 1)
3F8
2F8
3E8
2E8
UART divisor latch LSB (DLL)
1 (DLAB = 0)
3F9
2F9
3E9
2E9
UART interrupt enable register (IER)
1 (DLAB = 1)
3F9
2F9
3E9
2E9
UART divisor latch MSB (DLM)
2
3F
A
2F
A
3EA
2EA
UART interrupt identification register (IIR) − read only
2
3FA
2FA
3EA
2EA
UART FIFO control register (FCR) − write only
3
3FB
2FB
3EB
2EB
UART line control register (LCR)
4
3FC
2FC
3EC
2EC
UART modem control register (MCR) − bit 5 read only
5
3FD
2FD
3ED
2ED
UART line status register (LSR)
6
3FE
2FE
3EE
2EE
UART modem status rgister (MSR)
7
3FF
2FF
3EF
2EF
UART scratch register (SCR)
† DLAB is bit 7 of the line control register (LCR).


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