C8051F960-A-GQ Silicon Labs, C8051F960-A-GQ Datasheet - Page 264
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C8051F960-A-GQ
Manufacturer Part Number
C8051F960-A-GQ
Description
8-bit Microcontrollers - MCU 128KB DC-DC LCD AES
Manufacturer
Silicon Labs
Datasheet
1.C8051F960-A-GQ.pdf
(492 pages)
Specifications of C8051F960-A-GQ
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
Maximum Clock Frequency
24.5 MHz
Program Memory Size
128 KB
Data Ram Size
8 KB
On-chip Adc
Yes
Operating Supply Voltage
1.8 V to 3.8 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
QFP-80
Mounting Style
SMD/SMT
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C8051F96x
The following wake-up sources can be configured to wake the device from sleep mode:
The comparator requires a supply voltage of at least 1.8 V to operate properly. On C8051F96x devices, the
POR supply monitor can be disabled to save power by writing 1 to the MONDIS (PMU0MD.5) bit. When
the POR supply monitor is disabled, all reset sources will trigger a full POR and will re-enable the POR
supply monitor.
In addition, any falling edge on RST (due to a pin reset or a noise glitch) will cause the device to exit sleep
mode. In order for the MCU to respond to the pin reset event, software must not place the device back into
sleep mode for a period of 15 µs. The PMU0CF register may be checked to determine if the wake-up was
due to a falling edge on the RST pin. If the wake-up source is not due to a falling edge on RST, there is no
time restriction on how soon software may place the device back into sleep mode. A 4.7 k pullup resistor
to VDD is recommend for RST to prevent noise glitches from waking the device.
19.7. Configuring Wakeup Sources
Before placing the device in a low power mode, one or more wakeup sources should be enabled so that
the device does not remain in the low power mode indefinitely. For idle mode, this includes enabling any
interrupt. For stop mode, this includes enabling any reset source or relying on the RST pin to reset the
device.
Wake-up sources for suspend and sleep modes are configured through the PMU0CF register. Wake-up
sources are enabled by writing 1 to the corresponding wake-up source enable bit. Wake-up sources must
be re-enabled each time the device is placed in Suspend or Sleep mode, in the same write that places the
device in the low power mode.
The reset pin is always enabled as a wake-up source. On the falling edge of RST, the device will be
awaken from sleep mode. The device must remain awake for more than 15 µs in order for the reset to take
place.
19.8. Determining the Event that Caused the Last Wakeup
When waking from idle mode, the CPU will vector to the interrupt which caused it to wake up. When wak-
ing from stop mode, the RSTSRC register may be read to determine the cause of the last reset.
Upon exit from suspend or sleep mode, the wake-up flags in the PMU0CF register can be read to deter-
mine the event which caused the device to wake up. After waking up, the wake-up flags will continue to be
updated if any of the wake-up events occur. Wake-up flags are always updated, even if they are not
enabled as wake-up sources.
All wake-up flags enabled as wake-up sources in PMU0CF must be cleared before the device can enter
suspend or sleep mode. After clearing the wake-up flags, each of the enabled wake-up events should be
checked in the individual peripherals to ensure that a wake-up event did not occur while the wake-up flags
were being cleared.
264
Pulse Counter Count Reached Event
VBAT Monitor (part of LCD logic)
SmaRTClock Oscillator Fail
SmaRTClock Alarm
Port Match Event
Comparator0 Rising Edge
Rev. 0.5
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