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: 20/157页
文件大小: 2252K
代理商: MCC68HC711D3
Programmable Timer
Data Sheet
MC68HC711D3 — Rev. 2
116
Programmable Timer
MOTOROLA
not affect the state of PAOVF. When PAOVI is 0, pulse accumulator overflow
interrupts are inhibited, and the system operates in a polled mode, which
requires PAOVF to be polled by user software to determine when an overflow
has occurred. When the PAOVI control bit is set, a hardware interrupt request
is generated each time PAOVF is set. Before leaving the interrupt service
routine, software must clear PAOVF by writing to the TFLG2 register.
PAII and PAIF — Pulse Accumulator Input Edge Interrupt Enable and Flag
The PAIF status bit is automatically set each time a selected edge is detected
at the PA7/PAI/OC1 pin. To clear this status bit, write to the TFLG2 register with
a 1 in the corresponding data bit position (bit 4). The PAII control bit allows
configuring the pulse accumulator input edge detect for polled or
interrupt-driven operation but does not affect setting or clearing the PAIF bit.
When PAII is 0, pulse accumulator input interrupts are inhibited, and the system
operates in a polled mode. In this mode, the PAIF bit must be polled by user
software to determine when an edge has occurred. When the PAII control bit is
set, a hardware interrupt request is generated each time PAIF is set. Before
leaving the interrupt service routine, software must clear PAIF by writing to the
TFLG register.
Address:
$0024
Bit 7
654321
Bit 0
Read:
TOI
RTII
PAOVI
PAII
0
PR1
PR0
Write:
Reset:
00000000
Figure 8-22. Timer Interrupt Mask 2 Register (TMSK2)
Address:
$0025
Bit 7
654321
Bit 0
Read:
TOF
RTIF
PAOVF
PAIF
0000
Write:
Reset:
00000000
Figure 8-23. Timer Interrupt Flag 2 Register (TFLG2)
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