C8051T627-B-GM Silicon Labs, C8051T627-B-GM Datasheet - Page 173
C8051T627-B-GM
Manufacturer Part Number
C8051T627-B-GM
Description
8-bit Microcontrollers - MCU UBS, 64K OTP MCU
Manufacturer
Silicon Labs
Datasheet
1.C8051T626-B-GM.pdf
(298 pages)
Specifications of C8051T627-B-GM
Rohs
yes
Core
8051
Processor Series
C8051T627
Data Bus Width
8 bit
Maximum Clock Frequency
48 MHz
Program Memory Size
64 KB
Data Ram Size
3328 B
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 5.25 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
QFN-32
Mounting Style
SMD/SMT
Program Memory Type
EPROM
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With ISO Update enabled, new packets written to an ISO IN endpoint will not be transmitted until a new
Start-Of-Frame (SOF) is received. If the ISO IN endpoint receives an IN token before a SOF, USB0 will
transmit a zero-length packet. When ISOUP = 1, ISO Update is enabled for all ISO endpoints.
USB Enable: USB0 is disabled following a Power-On-Reset (POR). USB0 is enabled by clearing the
USBINH bit (POWER.4). Once written to 0, the USBINH can only be set to 1 by one of the following: (1) a
Power-On-Reset (POR), or (2) an asynchronous USB0 reset generated by writing 1 to the USBRST bit
(POWER.3).
Software should perform all USB0 configuration before enabling USB0. The configuration sequence
should be performed as follows:
1. Select and enable the USB clock source.
2. Reset USB0 by writing USBRST= 1.
3. Configure and enable the USB Transceiver.
4. Perform any USB0 function configuration (interrupts, Suspend detect).
5. Enable USB0 by writing USBINH = 0.
23.7. Function Configuration and Control
The USB register POWER (USB Register Definition 23.8) is used to configure and control USB0 at the
device level (enable/disable, Reset/Suspend/Resume handling, etc.).
USB Reset: The USBRST bit (POWER.3) is set to 1 by hardware when Reset signaling is detected on the
bus. Upon this detection, the following occur:
1. The USB0 Address is reset (FADDR = 0x00).
2. Endpoint FIFOs are flushed.
3. Control/status registers are reset to 0x00 (E0CSR, EINCSRL, EINCSRH, EOUTCSRL, EOUTCSRH).
4. USB register INDEX is reset to 0x00.
5. All USB interrupts (excluding the Suspend interrupt) are enabled and their corresponding flags cleared.
6. A USB Reset interrupt is generated if enabled.
Writing a 1 to the USBRST bit will generate an asynchronous USB0 reset. All USB registers are reset to
their default values following this asynchronous reset.
Suspend Mode: With Suspend Detection enabled (SUSEN = 1), USB0 will enter Suspend Mode when
Suspend signaling is detected on the bus. An interrupt will be generated if enabled (SUSINTE = 1). The
Suspend Interrupt Service Routine (ISR) should perform application-specific configuration tasks such as
disabling appropriate peripherals and/or configuring clock sources for low power modes. See Section
“21.3. Programmable Internal High-Frequency (H-F) Oscillator” on page 130 for more details on internal
oscillator configuration, including the Suspend mode feature of the internal oscillator.
USB0 exits Suspend mode when any of the following occur: (1) Resume signaling is detected or gener-
ated, (2) Reset signaling is detected, or (3) a device or USB reset occurs. If suspended, the internal oscil-
lator will exit Suspend mode upon any of the above listed events.
Resume Signaling: USB0 will exit Suspend mode if Resume signaling is detected on the bus. A Resume
interrupt will be generated upon detection if enabled (RESINTE = 1). Software may force a Remote
Wakeup by writing 1 to the RESUME bit (POWER.2). When forcing a Remote Wakeup, software should
write RESUME = 0 to end Resume signaling 10-15 ms after the Remote Wakeup is initiated (RESUME =
1).
ISO Update: When software writes 1 to the ISOUP bit (POWER.7), the ISO Update function is enabled.
C8051T620/1/6/7 & C8051T320/1/2/3
Rev. 1.2
173
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