mcs7715 MosChip, mcs7715 Datasheet - Page 4

• Manufacturer Part Number: mcs7715
• Description: Usb 1.1 To Single Uart And Printer Port
• Manufacturer: MosChip

Page 4
MCS7715
USB 1.1 to Single UART and Printer Port
Pin Assignments
TSTMODE
Pin Name
TSTPLL
RESET
XTAL1
XTAL2
nDSR
BUSY
nRTS
SLCT
nACK
nCD
PD7
DM
DP
RX
PE
Pin
10
12
15
18
19
20
22
23
24
25
26
3
4
6
7
9
Type
I/O
I/O
I/O
O
O
I
I
I
I
I
I
I
I
I
I
I
Crystal Oscillator input, or External Clock input pin (6 MHz).
This signal input is used in conjunction with XTAL2 to form a
feedback circuit for the internal timing. Two (10 pF) external
capacitors connected from each side of the crystal to GND are
required to form a Crystal Oscillator.
Crystal Oscillator output. See XTAL1 description.
Test Mode (active low, internal pull-up).
When this pin is tied to GND, the internal PLL is bypassed and an
external 48 MHz clock is used as the reference clock.
Internal Test Mode (active low, internal pull-up).
When this pin is tied to GND, the Internal Test Mode is enabled.
Upstream USB port differential Data Minus (D-), analog.
Upstream USB port differential Data Plus (D+), analog.
System Reset (active high).
Resets all internal registers, sequencers, and signals to a consistent
state. Connect to GND to use the internal Power-On-Reset circuit.
Carrier-Detect signal.
When low, this indicates that the modem or data set has detected
the Data Carrier. nCD has no effect on the transmitter.
Data-Set-Ready signal.
When low, this indicates that the modem or data set is ready
to establish a communication link. nDSR has no effect on the
transmitter or receiver.
UART Serial Data Input.
Request-To-Send signal.
It is set high (inactive) after a hardware reset or during internal loop-
back mode. When low, this indicates that the UART is ready to
exchange data.
Peripheral/Printer Selected (internal pull-up).
This pin is set high by the peripheral/printer when it is selected.
Paper Empty (internal pull-up).
This pin is set high by the peripheral/printer when printer paper is
empty.
Peripheral/Printer Busy (internal pull-up).
This pin is set high by the peripheral/printer when the printer or
peripheral is not ready to accept data.
Peripheral/Printer data Acknowledge (internal pull-up).
This pin is set low by the peripheral/printer to indicate a successful
data transfer has taken place.
Parallel printer port Data bit 7.
Description
Rev. 1.6