参数资料
型号: MC68HC11ED0MFU2
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 4/108页
文件大小: 1672K
代理商: MC68HC11ED0MFU2
Timing System
Timer Registers
MC68HC11ED0 — Rev. 1.0
Technical Summary
Timing System
RTII — Real-Time Interrupt Enable Bit
0 = RTIF interrupts disabled
1 = Interrupt requested when RTIF is set to 1
PAOVI — Pulse Accumulator Overflow Interrupt Enable Bit
PAII — Pulse Accumulator Interrupt Enable Bit
Bits [3:2] — Unimplemented
Always read as 0
PR[1:0] — Timer Prescaler Select Bits
In normal modes, PR1 and PR0 can be written only once, and the
writes must occur within 64 cycles after reset. Refer to Table 9-1 and
Table 9-4 for specific timing values.
NOTE:
Control bits [7:4] in TMSK2 correspond bit for bit with flag bits [7:4] in
TFLG2. Logic 1s in TMSK2 enable the corresponding interrupt sources.
Table 9-4. Timer Prescale
PR[1:0]
Prescaler
0 0
÷ 1
0 1
÷ 4
1 0
÷ 8
1 1
÷ 16
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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