参数资料
型号: MC68HC711D3CFN2
厂商: Freescale Semiconductor
文件页数: 71/124页
文件大小: 0K
描述: IC MCU 2MHZ 4K OTP 44-PLCC
标准包装: 26
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 2MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 26
程序存储器容量: 4KB(4K x 8)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
RESETS AND INTERRUPTS
5-6
TECHNICAL DATA
5.2.7 COP
The COP watchdog system is enabled if the NOCOP control bit in the CONFIG regis-
ter is clear, and disabled if NOCOP is set. The COP rate is set for the shortest duration
time-out.
5.2.8 SCI
The reset condition of the SCI system is independent of the operating mode. At reset,
the SCI baud rate is indeterminate and must be established by a software write to the
BAUD register. All transmit and receive interrupts are masked and both the transmitter
and receiver are disabled so the port pins default to being general-purpose I/O lines.
The SCI frame format is initialized to an 8-bit character size. The send break and re-
ceiver wake-up functions are disabled. The TDRE and TC status bits in the SCI status
register are both set, indicating that there is no transmit data in either the transmit data
register or the transmit serial shift register. The RDRF, IDLE, OR, NF, and FE receive-
related status bits are cleared.
5.2.9 SPI
The SPI system is disabled by reset. The port pins associated with this function default
to being general-purpose I/O lines.
5.2.10 System
The memory system is configured for normal read operation. PSEL[3:0] are initialized
with the value $0101, causing the external IRQ pin to have the highest I-bit interrupt
priority. The IRQ pin is configured for level sensitive operation (for wired-OR systems).
The RBOOT, SMOD, and MDA bits in the HPRIO register reflect the status of the
MODB and MODA inputs at the rising edge of reset. The DLY control bit in OPTION is
set to specify that an oscillator start-up delay is imposed upon recovery from STOP.
The clock monitor system is disabled by CME equals zero.
5.3 Reset and Interrupt Priority
Resets and interrupts have a hardware priority that determines which reset or interrupt
is serviced first when simultaneous requests occur. Any maskable interrupt can be giv-
en priority over other maskable interrupts.
The first six interrupt sources are not maskable. The priority arrangement for these
sources is as follows:
1.
POR or RESET pin
2.
Clock monitor reset
3.
COP watchdog reset
4. XIRQ interrupt
5. Illegal opcode interrupt
6. Software interrupt (SWI)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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