參數(shù)資料
型號(hào)： CR16MHS9VJEE
廠商： National Semiconductor Corporation
元件分類(lèi)： 16位微控制器
英文描述： Family of CompactRISC 16-Bit Microcontrollers
中文描述： 家庭CompactRISC 16位微控制器
文件頁(yè)數(shù)： 6/99頁(yè)
文件大?。?/td> 449K
代理商： CR16MHS9VJEE
www.national.com
6
3.5
The Interrupt Control Unit (ICU) receives interrupt requests
from internal and external sources and generates interrupts
to the CPU. An interrupt is an event that temporarily stops the
normal flow of program execution and causes a separate in-
terrupt service routine to be executed. After the interrupt is
serviced, CPU execution continues with the next instruction
in the program following the point of interruption.
Interrupts from the timers, USARTs, MICROWIRE/SPI inter-
face, multi-input wake-up, and A/D converter are all
maskable interrupts; they can be enabled or disabled by the
software. There are 16 of these maskable interrupts, orga-
nized into 16 predetermined levels of priority.
The highest-priority interrupt is the Non-Maskable Interrupt
(NMI), which is generated by a signal received on the NMI in-
put pin. This interrupt is not available in the 44-pin packages.
INTERRUPTS
3.6
The Multi-Input Wake-up (MIWU) module can be used for ei-
ther of two purposes: to provide inputs for waking up (exiting)
from the HALT, IDLE, or Power Save mode; or to provide
general-purpose edge-triggered maskable interrupts from
external sources. This eight-channel module generates one
combined interrupt to the CPU based on the signals received
on its eight input channels. Channels can be individually en-
abled or disabled, and programmed to respond to positive or
negative edges.
MULTI-INPUT WAKE-UP
3.7
DUAL CLOCK AND RESET
The Dual Clock and Reset (CLK2RES) module generates a
high-speed main system clock from an external crystal net-
work. It also provides the main system reset signal and a
power-on reset function.
In the 80-pin package, the module also generates a slow sys-
tem clock (32.768 KHz) from another external crystal net-
work. The slow clock is used for operating the device in
power-save mode. For the 44-pin devices and for devices not
using a secondary crystal network, the slow clock can be
generated by dividing the high-speed main clock by a pres-
caler factor.
3.8
POWER MANAGEMENT
The Power Management Module (PMM) improves the effi-
ciency of the device by changing the operating mode (and
therefore the power consumption) according to the current
level of activity.
The device can operate in any of four power modes:
Active: The device operates at full speed using the high-
frequency clock. All device functions are fully operational.
Power Save: The device operates at reduced speed using
the slow clock. The CPU and some modules can continue
to operate at this low speed.
IDLE: The device is inactive except for the Power Man-
agement Module and Timing and Watchdog Module,
which continue to operate using the slow clock.
HALT: The device is inactive but still retains its internal
state (RAM and register contents).
3.9
The Multi-Function Timer (MFT16) module contains two inde-
pendent timer/counter units called MFT1 and MFT2, each
containing a pair of 16-bit timer/counter registers. Each timer/
counter unit can be configured to operate in any of the follow-
ing modes:
Processor-Independent Pulse Width Modulation (PWM)
mode, which generates pulses of a specified width and
duty cycle, and which also provides a general-purpose
timer/counter
Dual Input Capture mode, which measures the elapsed
time between occurrences of external events, and which
also provides a general-purpose timer/counter
Dual Independent Timer mode, which generates system
timing signals or counts occurrences of external events
Single Input Capture and Single Timer mode, which pro-
vides one external event counter and one system timer
MULTI-FUNCTION TIMER
3.10
REAL-TIME TIMER AND WATCHDOG
The Timing and Watchdog Module (TWM) generates the
clocks and interrupts used for timing periodic functions in the
system. It also provides Watchdog protection against soft-
ware errors. The module operates on the slow (32.768 KHz)
clock.
The real-time timer generates a periodic interrupt to the CPU
at a software-programmed interval. This can be used for real-
time functions such as a time-of-day clock.
The Watchdog is designed to detect program execution er-
rors such as an infinite loop or a “runaway” program. Once
Watchdog operation is initiated, the application program
must periodically write a specific value to a Watchdog regis-
ter, within specific time intervals. If the software fails to do so,
a Watchdog error is triggered, which resets the device.
3.11
The USART is a Universal Synchronous/Asynchronous Re-
ceiver-Transmitter, a device used for serial communications.
It supports a wide range of programmable baud rates and
data formats, and handles parity generation and several er-
ror detection schemes. The baud rate is generated on-chip,
under software control.
The synchronous mode of operation is not available in the
44-pin devices.
USART
3.12
The MICROWIRE/SPI (MWSPI) interface module supports
asynchronous serial communications with other devices that
conform to MICROWIRE or Serial Peripheral Interface (SPI)
specifications.
The MICROWIRE interface allows several devices to com-
municate over a single system consisting of three wires: se-
rial in, serial out, and shift clock. At any given time, one
device on the MICROWIRE interface operates as the master,
while all other devices operate as slaves. An 80-pin device
supports the full set of slave select and Ready lines for multi-
slave implementation, while a 44-pin device has only the ba-
sic Data-in/Data-out/Clock lines, limiting its implementation
to master mode.
MICROWIRE/SPI
相關(guān)PDF資料
PDF描述
CR16MHS9VJEI Family of CompactRISC 16-Bit Microcontrollers
CR16MNS5 Family of CompactRISC 16-Bit Microcontrollers
CR16MNS544VC Family of CompactRISC 16-Bit Microcontrollers
CR16MNS544VI Family of CompactRISC 16-Bit Microcontrollers
CR16MNS9 Family of CompactRISC 16-Bit Microcontrollers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CR16MHS9VJEI 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers
CR16MNS5 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers
CR16MNS544V8Y 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Microcontroller
CR16MNS544V9Y 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Microcontroller
CR16MNS544VC 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers
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