CY7C63000A/CY7C63001A
CY7C63100A/CY7C63101A
FOR
FOR
Document #: 38-08026 Rev. **
Page 7 of 31
5.0
Functional Description
The Cypress CY7C630/1XXA USB microcontrollers are optimized for human-interface computer peripherals such as a mouse,
joystick, and gamepad. These USB microcontrollers conform to the low-speed (1.5 Mbps) requirements of the USB Specification
version 1.1. Each microcontroller is a self-contained unit with: a USB interface engine, USB transceivers, an 8-bit RISC micro-
controller, a clock oscillator, timers, and program memory. Each microcontroller supports one USB device address and two
endpoints.
The 6-MHz clock is doubled to 12 MHz to drive the microcontroller. A RISC architecture with 35 instructions provides the best
balance between performance and product cost.
5.1
Memory Organization
The memory in the USB Controller is organized into user program memory in EPROM space and data memory in SRAM space.
5.1.1
Program Memory Organization
The program space of the CY7C63000A and CY7C63100A is 2 Kbytes each. For applications requiring more program space,
the CY7C63001A and CY7C63101A each offer 4 Kbytes of EPROM. The program memory space is divided into two functional
groups: interrupt vectors and program code.
The interrupt vectors occupy the first 16 bytes of the program space. Each vector is 2 bytes long. After a reset, the Program
Counter points to location zero of the program space. Figure 5-1 shows the organization of the Program Memory Space.
5.1.2
Security Fuse Bit
The Cypress USB microcontroller includes a security fuse bit. When the security fuse is programmed, the EPROM program
memory outputs 0xFF to the EPROM programmer, thus protecting the user’s code.
after reset
Address
PC
0x0000
Reset Vector
0x0002
Interrupt Vector - 128
µs
0x0004
Interrupt Vector - 1.024 ms
0x0006
Interrupt Vector - USB Endpoint 0
0x0008
Interrupt Vector - USB Endpoint 1
0x000A
Reserved
0x000C
Interrupt Vector - GPIO
0x000E
Interrupt Vector - Cext
0x0010
On-chip program Memory
0x07FF
2K ROM (CY7C63000A, CY7C63100A)
0x0FFF
4K ROM (CY7C63001A, CY7C63101A)
Figure 5-1. Program Memory Space
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