参数资料
型号: MC68HC11D3CP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PDIP40
封装: DIP-40
文件页数: 3/131页
文件大小: 1640K
代理商: MC68HC11D3CP
MOTOROLA
TIMING SYSTEM
MC68HC11D3
9-14
TECHNICAL DATA
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 Interrupt Flag
The RTIF status bit is automatically set to one at the end of every RTI period. To clear
RTIF, write a byte to TFLG2 with bit 6 set.
PAOVF — Pulse Accumulator Overflow Interrupt Flag
PAIF — Pulse Accumulator Input Edge Interrupt Flag
Bits [3:0] — Not implemented
Always read zero
9.4.2 Pulse Accumulator Control Register
Bits RTR[1:0] of this register select the rate for the real-time interrupt system. Bit
DDRA3 determines whether Port A bit three is an input or an output when used for
general-purpose I/O. The remaining bits control the pulse accumulator.
DDRA7 — Data Direction Control for Port A Bit 7
PAEN — Pulse Accumulator System Enable
PAMOD — Pulse Accumulator Mode
PEDGE — Pulse Accumulator Edge Control
DDRA3 — Data Direction Register for Port A Bit 3
I4/O5 — Input Capture 4/Output Compare 5
TFLG2 — Timer Interrupt Flag 2
$0025
Bit 7
654321
Bit 0
TOF
RTIF
PAOVF
PAIF
0
RESET:
0000000
0
PACTL — Pulse Accumulator Control
$0026
Bit 7
654321
Bit 0
DDRA7
PAEN
PAMOD
PEDGE
DDRA3
I4/O5
RTR1
RTR0
RESET:
0000000
0
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