mcs7715 MosChip, mcs7715 Datasheet - Page 29

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

Rev. 1.6
PP_REGISTER:
This register is used for internal debugging of UDC controller & bridge circuitry. There is a bit which resets the
Parallel Printer port. There are bits which control the input clock fed to the Parallel Printer port.
Register:
Description:
Offset:
Permissions:
Access Condition:
pp reset: This bit will reset the Parallel Printer port.
When this bit is a 1 the Parallel Printer port is under
the Reset process. Whenever the frequency is to
be changed, first set the Reset bit, change the clk_
frequency, and finally clear the Reset bit to 0.
clk_freq_select Changes the clock fed to the Parallel Printer port.
pp_reset
pp_bo_clear
pp_bi_clear
Bit[7]
Reserved
udc_loop
pp_reset
Bit
PP_REG
Parallel Printer Port Register
0x04
Read/Write
Application Number = 0x0000
Bit[6]
When enabled, loops the data from the Bulk-Out FIFO to the Bulk-In FIFO.
Reserved
Reset the Bulk-Out FIFO
Reset the Bulk-In FIFO
Resets the Parallel Printer port
clk_freq_select
Bit[5]
Bit[4]
clk_freq_select: Changes the clock fed to the
Parallel Printer port as shown in the table below.
pp_bi_clear pp_bo_clear Reserved
USB 1.1 to Single UART and Printer Port
Option
3’b000
3’b001
3’b010
3’b100
3’b011
Bit[3]
Description
Bit[2]
Input Clock Frequency
MCS7715
0.75 MHz
1.5 MHz
12 MHz
6 MHz
3 MHz
Bit[1]
udc_loop
Bit[0]
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