mcs7715 MosChip, mcs7715 Datasheet - Page 28

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

Page 28
MCS7715
USB 1.1 to Single UART and Printer Port
Vendor Specific Command Registers:
There are three vendor specific registers which are used to tune the behavior and performance of the UART
and Parallel Port. They are as follows
SP_REGISTER:
This register is used for internal debugging of UDC controller & bridge circuitry. This enables the designer to
pin point the problem in the design. This register also enables the hardware flow control. This register has
bits which clear the Bulk-In & Bulk-Out FIFOs. There is a bit which resets the UART. There are bits which
control the input clock fed to the UART, providing options for higher Baud Rates.
Register:
Description:
Offset:
Permissions:
Access Condition:
•
•
•
SP_REG
PP_REG
SP_CONTROL_REG
Clk_UART_Select: Changes the clock fed to the Serial Port as shown in the table below.
UART_Reset
Ser_line_err_ctl_en
Clk_UART_Select Changes the clock fed to UART as shown in the table below
UART_Reset
Sp_bo_clear
Bit[7]
Sp_bi_clear
Udc_loop
Bit
SP_REG
Serial Port Register
0x01
Read/Write
Application Number = 0x0000
Bit[6] Bit[5] Bit[4]
Clk_UART_Select
Option
3’b000
3’b001
3’b010
3’b100
3’b011
When enabled, loops the data from the Bulk-Out FIFO to the Bulk-In FIFO.
When enabled, will not allow the data from the UART to be written into the
Bulk-In FIFO if there are any errors in the received data.
Reset the Bulk-Out FIFO
Reset the Bulk-In FIFO
Resets the UART
Input Clock Frequency
Sp_bi_clear Sp_bo_clear Ser_line_err_ctl_en Udc_loop
Bit[3]
0.75 MHz
1.5 MHz
12 MHz
6 MHz
3 MHz
Description
Bit[2]
Bit[1]
Bit[0]
Rev. 1.6