參數(shù)資料
型號(hào): MC68HC08LT8
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 73/156頁
文件大?。?/td> 1030K
代理商: MC68HC08LT8
PPI1 Status and Control Register (PPI1SCR)
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
73
7.6 PPI1 Status and Control Register (PPI1SCR)
The PPI1 status and control register (PPI1SCR) controls and monitors the operation of the PPI module.
PPI1L — PPI1 Interrupt Flag
This read/write bit indicates a interrupt request is generated by PPI1 and is pending for
acknowledgement. This bit generates an interrupt to the CPU if PPI1MSK=0.
The PPI1L bit is cleared by writing logic 1 to it.
1 = Read: PPI1 interrupt request is pending / Write: PPI1 interrupt acknowledge
0 = No PPI1 interrupt request is pending
PPI1MSK — PPI1 Interrupt Mask
Writing a logic one to this read/write bit disables PPI1 interrupt requests. Reset clears PPI1MSK.
1 = PPI1 interrupt requests disabled
0 = PPI1 interrupt requests enabled
PPI1CLKS[1:0] — PPI1 Clock Source Select Bits
These two bits select the clock source for the PPI.
Table 7-1. PPI1 Clock Source Selection
PPI1IE[2:0] —PPI1 Interrupt Period Select Bits
These three bits select the PPI interrupt period. The PPI is disabled when PPI1IE[2:0] are zero and no
interrupts are generated.
Table 7-2. PPI1 Interrupt Period Selection
Address:
$0019
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PPI1L
PPI1MSK
PPICLKS1
PPI1CLKS0
0
PPI1IE2
PPI1IE1
PPI1IE0
Write:
Reset:
0
0
1
0
0
0
0
0
Figure 7-2. PPI1 Status and Control Register (PPI1SCR)
PPI1CLKS[1:0]
Clock Source for PPI1
00
Reserved
01
External clock from PPIECK pin
10
32KXCLK from OSC module
11
Reserved
PPI1IE[2:0]
Interrupt Period
000
PPI and its associated interrupts are disabled
001
512 PPI counts
010
1,024 PPI counts
011
2,048 PPI counts
100
4,096 PPI counts
101
8,192 PPI counts
110
16,384 PPI counts
111
32,768 PPI counts
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