参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 12/157页
文件大小: 2252K
代理商: MCC68HC711D3
Programmable Timer
Output Compare (OC)
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Programmable Timer
109
PAII — Pulse Accumulator Input Edge Interrupt Enable Bit
NOTE:
Bits in TMSK2 correspond bit for bit with flag bits in TFLG2. Ones in TMSK2 enable
the corresponding interrupt sources.
PR1 and PR0 — Timer Prescaler Select Bits
These bits are used to select the prescaler divide-by ratio. In normal modes,
PR1 and PR0 can be written once only, and the write must be within 64 cycles
after reset. Refer to Table 8-4 for specific timing values.
8.4.10 Timer Interrupt Flag 2 Register
The timer interrupt flag 2 register (TFLG2) bits 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 1 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 0.
Table 8-4. Timer Prescale
PR1 and PR0
Prescaler
0 0
1
0 1
4
1 0
8
1 1
16
Address:
$0025
Bit 7
654321
Bit 0
Read:
TOF
RTIF
PAOVF
PAIF
0000
Write:
Reset:
00000000
Figure 8-15. Timer Interrupt Flag 2 Register (TFLG2)
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