STV3550B STMicroelectronics, STV3550B Datasheet - Page 87

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

STV3550
Figure 57. Example of wake-up interrupt management
6.7
Ext IT1
Ext IT2
Ext IT3
Ext IT4
Interrupt management
In standby mode, only the following blocks are clocked:
●
●
●
In addition to standby mode, the STV3550 includes various low power modes.
These modes are performed by reducing the clock frequency for each block, or by switching
off the blocks that are not in use (see power off bit or RST_soft reset bit for each block).
The ST20 core includes an interrupt controller (ITC) able to manage up to 16 interrupt
levels. On top of this block, the STV3550 has an interrupt level controller (ILC) which
connects the 57 interrupt sources.
The interrupt sources can be on-chip or off-chip.They can be synchronous or asynchronous
(the ILC re-synchronizes the asynchronous sources). Certain interrupt sources can also
behave as wake-up sources used to exit standby mode.
AD6
AD1
IR
Infrared preprocessor
RTC
ADC
Analog-to-Digital
External IT 1
External IT 2
External IT 3
External IT 4
Converter
Processor
Infrared
10-bit
CPU and system management functional description
adc clk
EXTALIN
(from ILC3)
Wake-up
27 MHz
Generator
(OR)
ITC
Timer
RTC
Clock
EXTALOUT
Wake-up
Clk toward
other blocks
switched off
in Standby
mode (CPU)
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