C8051F321-GMR Datasheet, PDF (21/250 Pages) Silicon Laboratories – Full Speed USB, 16 k ISP FLASH MCU Family

C8051F320/1
The USB Transceiver is USB 2.0 compliant, and includes on-chip matching and pull-up resistors. The pull-
up resistors can be enabled/disabled in software, and will appear on the D+ or D– pin according to the soft-
ware-selected speed setting (Full or Low Speed).
Transceiver
VDD
D+
D-
Serial Interface Engine (SIE)
Endpoint0
Data
Transfer
Control
IN/OUT
Endpoint1
Endpoint2
IN ^EOnUdpToint3
IN OUT
IN OUT
USB
Control,
Status, and
Interrupt
Registers
CIP-51 Core
USB FIFOs
(1k RAM)
Figure 1.5. USB Controller Block Diagram
1.4. Voltage Regulator
C8051F320/1 devices include a 5-to-3 V voltage regulator (REG0). When enabled, the REG0 output
appears on the VDD pin and can be used to power external devices. REG0 can be enabled/disabled by
software.
1.5. On-Chip Debug Circuitry
The C8051F320/1 devices include on-chip Silicon Labs 2-Wire (C2) debug circuitry that provides non-intru-
sive, full speed, in-circuit debugging of the production part installed in the end application.
Silicon Labs' debugging system supports inspection and modification of memory and registers, break-
points, and single stepping. No additional target RAM, program memory, timers, or communications chan-
nels are required. All the digital and analog peripherals are functional and work correctly while debugging.
All the peripherals (except for the USB, ADC, and SMBus) are stalled when the MCU is halted, during sin-
gle stepping, or at a breakpoint in order to keep them synchronized.
The C8051F320DK development kit provides all the hardware and software necessary to develop applica-
tion code and perform in-circuit debugging with the C8051F320/1 MCUs. The kit includes software with a
developer's studio and debugger, 8051 assembler and linker, evaluation ‘C’ compiler, and a debug
adapter. It also has a target application board with the C8051F320 MCU installed, the necessary cables for
connection to a PC, and a wall-mount power supply. The development kit contents may also be used to
program and debug the device on the production PCB using the appropriate connections for the program-
ming pins.
The Silicon Labs IDE interface is a vastly superior developing and debugging configuration, compared to
standard MCU emulators that use on-board "ICE Chips" and require the MCU in the application board to
Rev. 1.4
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