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参数资料
| 型号： | MC68HC11D3CFN1 |
| 厂商： | ABILIS SYSTEMS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 1 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 123/124页 |
| 文件大小： | 6875K |
| 代理商： | MC68HC11D3CFN1 |
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TIMING SYSTEM
9-12
TECHNICAL DATA
PR[1:0] — Timer Prescaler Select
These bits are used to select the prescaler divide-by ratio. In normal modes, PR[1:0]
can only be written once, and the write must be within 64 cycles after reset. Refer to
Table 9-1 for specific timing values.
9.3.10 Timer Interrupt Flag 2 Register
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
Refer to 9.4 Real-Time Interrupt.
PAOVF — Pulse Accumulator Overflow Interrupt Flag
Refer to 9.6 Pulse Accumulator.
PAIF — Pulse Accumulator Input Edge Interrupt Flag
Refer to 9.6 Pulse Accumulator.
Bits [3:0]— Not implemented
Always read zero
9.4 Real-Time Interrupt
The real-time interrupt feature, used to generate hardware interrupts at a fixed periodic
rate, is controlled and configured by two bits (RTR1 and RTR0) in the pulse accumu-
lator 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 oscillator fre-
quency and the value of bits RTR[1:0]. Refer to the following table, which shows the
periodic real-time interrupt rates.
PR[1:0]
Prescaler
0 0
1
0 1
4
1 0
8
1 1
16
TFLG2 — Timer Interrupt Flag 2
$0025
Bit 7
654321
Bit 0
TOF
RTIF
PAOVF
PAIF
0
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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相关代理商/技术参数 |
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|---|---|
| MC68HC11D3CFN2 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Microcontrollers |
| MC68HC11D3CFN3 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
| MC68HC11D3CFN4 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
| MC68HC11D3CFU | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
| MC68HC11D3CFU1 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:ROM-based high-performance microcontrollers |
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