ST10F272M-4TR3 STMicroelectronics, ST10F272M-4TR3 Datasheet - Page 102

• Manufacturer Part Number: ST10F272M-4TR3
• Description: MCU 16BIT 256K FLASH 144-LQFP
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10F272M-4TR3

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: ASC, CAN, EBI/EMI, I²C, SSC, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 111
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 20K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 24x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 144-MQFP, 144-PQFP
• Processor Series: ST10F27x
• Core: ST10
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Power reduction modes
21
Note:
21.1
21.2
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Power reduction modes
Three different power reduction modes with different levels of power reduction have been
implemented in the ST10F272M. In idle mode only CPU is stopped, while peripheral still
operates. In power-down mode both CPU and peripherals are stopped. In stand-by mode
the main power supply (V
powered via V
Idle and power-down modes are software activated by a protected instruction and are
terminated in different ways as described in the following sections.
Stand-by mode is entered simply removing V
All external bus actions are completed before idle or power-down mode is entered. However,
idle or power-down mode is not entered if READY is enabled, but has not been activated
(driven low for negative polarity, or driven high for positive polarity) during the last bus
access.
Idle mode
Idle mode is entered by running IDLE protected instruction. The CPU operation is stopped
and the peripherals still run.
Idle mode is terminated by any interrupt request. Whatever the interrupt is serviced or not,
the instruction following the IDLE instruction will be executed after return from interrupt
(RETI) instruction, then the CPU resumes the normal program.
Power-down mode
Power-down mode starts by running PWRDN protected instruction. Internal clock is
stopped, all MCU parts are on hold including the watchdog timer. The only exception could
be the real-time clock if opportunely programmed and one of the two oscillator circuits as a
consequence (either the main or the 32 kHz on-chip oscillator).
When real-time clock module is used, when the device is in power-down mode a reference
clock is needed. In this case, two possible configurations may be selected by the user
application according to the desired level of power reduction:
●
●
There are two different operating power-down modes: protected mode and interruptible
mode.
A 32 kHz crystal is connected to the on-chip low-power oscillator (pins XTAL3 / XTAL4)
and running. In this case the main oscillator is stopped when power-down mode is
entered, while the real-time clock continue counting using 32 kHz clock signal as
reference. The presence of a running low-power oscillator is detected after the power-
on: this clock is immediately assumed (if present, or as soon as it is detected) as
reference for the real-time clock counter and it will be maintained forever (unless
specifically disabled via software).
Only the main oscillator is running (XTAL1 / XTAL2 pins). In this case the main
oscillator is not stopped when power-down is entered, and the real-time clock continue
counting using the main oscillator clock signal as reference.
STBY
dedicated power pin.
DD
) can be turned off while a portion of the internal RAM remains
DD
, holding the MCU under reset state.
ST10F272M