参数资料
型号: ST10F273M-4QR3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 64 MHz, MICROCONTROLLER, PQFP144
封装: 28 X 28 MM, 3.40 MM HEIGHT, 0.65 MM PITCH, PLASTIC, QFP-144
文件页数: 162/182页
文件大小: 3222K
代理商: ST10F273M-4QR3
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Real time clock
ST10F273M
18
Real time clock
The Real Time Clock is an independent timer, in which the clock is derived directly from the
clock oscillator on XTAL1 (main oscillator) input or XTAL3 input (32 kHz low-power oscillator)
so that it can continue running even in Idle or Power-down modes (if so enabled). Registers
access is implemented onto the XBUS. This module is designed with the following
characteristics:
generation of the current time and date for the system
cyclic time based interrupt, on Port2 external interrupts every “RTC basic clock tick”
and after n ’RTC basic clock ticks’ (n is programmable) if enabled
58-bit timer for long term measurement
capability to exit the ST10 chip from Power-down mode (if PWDCFG of SYSCON set)
after a programmed delay
The real time clock is based on two main blocks of counters. The first block is a prescaler
which generates a basic reference clock (for example, a 1 second period). This basic
reference clock is provided by the 20-bit DIVIDER. This 20-bit counter is driven by an input
clock derived from the on-chip CPU clock, predivided by a 1/64 fixed counter. This 20-bit
counter is loaded at each basic reference clock period with the value of the 20-bit
PRESCALER register. The value of the 20-bit RTCP register determines the period of the
basic reference clock.
A timed interrupt request (RTCSI) may be sent on each basic reference clock period. The
second block of the RTC is a 32-bit counter that may be initialized with the current system
time. This counter is driven with the basic reference clock signal. In order to provide an
alarm function the contents of the counter is compared with a 32-bit alarm register. The
alarm register may be loaded with a reference date. An alarm interrupt request (RTCAI),
may be generated when the value of the counter matches the alarm register.
The timed RTCSI and the alarm RTCAI interrupt requests can trigger a fast external
interrupt via the EXISEL register of port 2 and wake up the ST10 chip when running power-
down mode. Using the RTCOFF bit of the RTCCON register, the user may switch off the
clock oscillator when entering the power-down mode.
The last function implemented in the RTC is to switch off the main on-chip oscillator and the
32 kHz on chip oscillator if the ST10 enters the Power-down mode, so that the chip can be
fully switched off (if RTC is disabled).
At power-on, and after Reset phase, if the presence of a 32 kHz oscillation on XTAL3 /
XTAL4 pins is detected, then the RTC counter is driven by this low frequency reference
clock: when Power-down mode is entered, the RTC can either be stopped or left running,
and in both the cases the main oscillator is turned off, reducing the power consumption of
the device to the minimum required to keep on running the RTC counter and relative
reference oscillator. This is also valid if Standby mode is entered (switching off the main
supply VDD), since both the RTC and the low power oscillator (32 kHz) are biased by the
VSTBY. Vice versa, when at power on and after Reset, the 32 kHz is not present, the main
oscillator drives the RTC counter, and since it is powered by the main power supply, it
cannot be maintained running in Standby mode, while in Power-down mode the main
oscillator is maintained running to provide the reference to the RTC module (if not disabled).
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相关代理商/技术参数
参数描述
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ST10F273M-4TR3 功能描述:16位微控制器 - MCU 16-bit MCU 512 Kbyte Flash memory 36 Kbyt RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
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