参数资料
型号: MC68HC11F1CPU4
厂商: Freescale Semiconductor
文件页数: 22/158页
文件大小: 0K
描述: IC MCU 512 EEPROM 4MHZ 80-LQFP
标准包装: 90
系列: HC11
核心处理器: HC11
芯体尺寸: 8-位
速度: 4MHz
连通性: SCI,SPI
外围设备: POR,WDT
输入/输出数: 30
程序存储器类型: ROMless
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.75 V ~ 5.25 V
数据转换器: A/D 8x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 80-LQFP
包装: 托盘
TIMING SYSTEM
MC68HC11F1
9-12
TECHNICAL DATA
NOTE
Bits in TMSK2 correspond bit for bit with flag bits in TFLG2. Ones in
TMSK2 enable the corresponding interrupt sources.
9.3.10 Timer Interrupt Flag Register 2
Bits in this register indicate when certain timer system events have occurred. Coupled
with the four high-order bits of TMSK2, the bits of TFLG2 allow the timer subsystem to
operate in either a polled or interrupt driven system. Each bit of TFLG2 corresponds
to a bit in TMSK2 in the same position.
Clear flags by writing a one to the corresponding bit position(s).
TOF — Timer Overflow Interrupt Flag
Set when TCNT changes from $FFFF to $0000
RTIF — Real-Time (Periodic) Interrupt Flag
PAOVF — Pulse Accumulator Overflow Interrupt Flag
PAIF — Pulse Accumulator Input Edge Interrupt Flag
Bits [3:0] — Not implemented
Always read zero
9.4 Real-Time Interrupt
The real-time interrupt (RTI) feature, used to generate hardware interrupts at a fixed
periodic rate, is controlled and configured by two bits (RTR1 and RTR0) in the pulse
accumulator control (PACTL) register. The RTII bit in the TMSK2 register enables the
interrupt capability. The four different rates available are a product of the MCU oscil-
lator frequency and the value of bits RTR[1:0]. Refer to Table 9-4, which shows the
periodic real-time interrupt rates.
Table 9-3 Timer Prescaler Selection
PR[1:0]
Prescaler
0 0
1
0 1
4
1 0
8
1 1
16
TFLG2 — Timer Interrupt Flag 2
$1025
Bit 7
654321
Bit 0
TOF
RTIF
PAOVF
PAIF
RESET:
0000000
0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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