參數(shù)資料
型號: MC68HC711D3MP2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 16/157頁
文件大小: 2252K
代理商: MC68HC711D3MP2
Programmable Timer
Data Sheet
MC68HC711D3 — Rev. 2
112
Programmable Timer
MOTOROLA
8.5.3 Pulse Accumulator Control Register
Bits RTR1 and RTR0 of the pulse accumulator control register (PACTL) 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 Bit
PAMOD — Pulse Accumulator Mode Bit
PEDGE — Pulse Accumulator Edge Control Bit
DDRA3 — Data Direction Register for Port A Bit 3
I4/O5 — Input Capture 4/Output Compare 5 Bit
RTR1 and RTR0 — RTI Interrupt Rate Select Bits
These two bits determine the rate at which the RTI system requests interrupts.
The RTI system is driven by an E divided by 213 rate clock that is compensated
so it is independent of the timer prescaler. These two control bits select an
additional division factor. See Table 8-6.
Address:
$0026
Bit 7
654321
Bit 0
Read:
DDRA7
PAEN
PAMOD
PEDGE
DDRA3
I4/O5
RTR1
RTR0
Write:
Reset:
00000000
Figure 8-18. Pulse Accumulator Control Register (PACTL)
Table 8-6. Real-Time Interrupt Rates
RTR1
and RTR0
E = 1 MHz
E = 2 MHz
E = 3 MHz
E = X MHz
0 0
0 1
1 0
1 1
2.731 ms
5.461 ms
10.923 ms
21.845 ms
4.096 ms
8.192 ms
16.384 ms
32.768 ms
8.192 ms
16.384 ms
32.768 ms
65.536 ms
(E/213)
(E/214)
(E/215)
(E/216)
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