CY7C63001A
CY7C63101A
after reset
DSP
PSP
Address
0x00
0x02
0x04
user
firmware
DSP
0x70
USB FIFO – Endpoint 0
0x77
0x78
USB FIFO – Endpoint 1
0x7F
Figure 6-2. Data Memory Space
6.2
I/O Register Summary
I/O registers are accessed via the I/O Read (IORD) and I/O
Write (IOWR, IOWX) instructions.
Table 6-1. I/O Register Summary
Register Name
P0 Data
P1 Data
P0 IE
P1 IE
P0 Pull-up
P1 Pull-up
EP0 TX Config.
EP1 TX Config.
USB DA
USB SCR
EP0 RX Status
GIE
WDT
Cext
Timer
P0 Isink
I/O Address
0x00
0x01
0x04
0x05
0x08
0x09
0x10
0x11
0x12
0x13
0x14
0x20
0x21
0x22
0x23
0x30-0x37
Read/Write
R/W
R/W
W
W
W
W
R/W
R/W
R/W
R/W
R/W
R/W
W
R/W
R
W
Function
General purpose I/O Port (low current)
General purpose I/O Port (high current)
Interrupt enable for Port 0 pins
Interrupt enable for Port 1 pins
Pull-up resistor control for Port 0 pins
Pull-up resistor control for Port 1 pins
USB Endpoint 0 transmit configuration
USB Endpoint 1 transmit configuration
USB device address
USB status and control
USB Endpoint 0 receive status
Global Interrupt Enable
Watchdog Timer clear
External R-C Timing circuit control
Free-running timer
Page
Input sink current control for Port 0 pins. There is one
Isink register for each pin. Address of the Isink register
for pin 0 is located at 0x30 and the register address for
pin 7 is located at 0x37.
Document #: 38-08026 Rev. *A
Page 5 of 25
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