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MC68331CPV16 参数 Datasheet PDF下载

MC68331CPV16图片预览
型号: MC68331CPV16
PDF下载: 下载PDF文件 查看货源
内容描述: 用户手册 [User’s Manual]
分类和应用: 微控制器和处理器外围集成电路时钟
文件页数/大小: 254 页 / 1319 K
品牌: MOTOROLA [ MOTOROLA ]
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D.2.7 PACTL — Pulse Accumulator Control Register  
PACNT — Pulse Accumulator Counter  
$YFF90C  
$YFF90D  
15  
PAIS  
RESET:  
U
14  
13  
12  
11  
10  
9
8
7
0
PAEN PAMOD  
PEDGE  
PCLKS  
I4/O5  
PACLK  
PACNT  
0
0
0
0
U
0
0
0
0
0
0
0
0
0
0
PACTL enables the pulse accumulator and selects either event counting or gated  
mode. In event counting mode, PACNT is incremented each time an event occurs. In  
gated mode, it is incremented by an internal clock.  
PAIS — PAI Pin State (Read Only)  
PAEN — Pulse Accumulator Enable  
0 = Pulse accumulator disabled  
1 = Pulse accumulator enabled  
PAMOD — Pulse Accumulator Mode  
0 = External event counting  
D
1 = Gated time accumulation  
PEDGE — Pulse Accumulator Edge Control  
The effects of PEDGE and PAMOD are shown in the following table.  
PAMOD  
PEDGE  
Effect  
0
0
1
1
0
1
0
1
PAI Falling Edge Increments Counter  
PAI Rising Edge Increments Counter  
Zero on PAI Inhibits Counting  
One on PAI Inhibits Counting  
PCLKS — PCLK Pin State (Read Only)  
I4/O5 — Input Capture 4/Output Compare 5  
0 = Output compare 5 enabled  
1 = Input capture 4 enabled  
PACLK[1:0] — Pulse Accumulator Clock Select (Gated Mode)  
PACLK[1:0]  
Pulse Accumulator Clock Selected  
00  
01  
10  
11  
System Clock Divided by 512  
Same Clock Used to Increment TCNT  
TOF Flag from TCNT  
External Clock, PCLK  
PACNT — Pulse Accumulator Counter  
Eight-bit read/write counter used for external event counting or gated time accumula-  
tion.  
MC68331  
REGISTER SUMMARY  
MOTOROLA  
D-7  
USER’S MANUAL