參數(shù)資料
型號: C8051F000
廠商: Cygnal Technologies
英文描述: 20 MIPS,32k Flash,256 Ram,12bit ADC,64 Pin MCU(20 MIPS,32k 閃速存儲器,256 Ram,12位 ADC,64 腳 MCU)
中文描述: 20 MIPS的,32K閃存,256羊,12位ADC,64引腳微控制器(20 MIPS的,32K的閃速存儲器,256,羊,12位ADC和64腳微控制器)
文件頁數(shù): 155/170頁
文件大小: 1294K
代理商: C8051F000
4.2001; Rev. 1.3
CYGNAL Integrated Products, Inc.
2001
Page 155
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
PRELIMINARY
20.1.2. Software Timer (Compare) Mode
In Software Timer mode, the PCA counter/timer is compared to the module’s 16-bit capture/compare register
(PCA0CPHn and PCA0CPLn). When a match occurs, the Capture/Compare Flag (CCFn) in PCA0CN is set to logic
1 and an interrupt request is generated if CCF interrupts are enabled. The CCFn bit is not automatically cleared by
hardware when the CPU vectors to the interrupt service routine, and must be cleared by software. Setting the
ECOMn and MATn bits in the PCA0CPMn register enables Software Timer mode.
Figure 20.4. PCA Software Timer Mode Diagram
20.1.3. High Speed Output Mode
In this mode, each time a match occurs between the PCA Timer Counter and a module’s 16-bit capture/compare
register (PCA0CPHn and PCA0CPLn) the logic level on the module’s associated CEXn pin will toggle. Setting the
TOGn, MATn, and ECOMn bits in the PCA0CPMn register enables the High-Speed Output mode.
Figure 20.5. PCA High Speed Output Mode Diagram
Match
16-bit Comparator
PCA0H
PCA0CPHn
Enable
PCA0L
PCA
Timebase
PCA0CPLn
PCA0CPMn
C
A
P
P
n
n
0 0
E
C
O
M
n
E
C
C
F
n
x
T
O
G
n
P
W
M
n
C
A
P
N
M
A
T
n
0 0
PCA0CN
C
R
C
F
4
C
F
C
C
F
0
C
C
F
2
C
C
F
1
C
C
C
F
3
PCA Interrupt
0
1
ENB
ENB
1
0
Write to
PCA0CPLn
Reset
Write to
PCA0CPHn
Match
16-bit Comparator
PCA0H
PCA0CPHn
Enable
PCA0L
PCA
Timebase
PCA0CPLn
PCA0CN
C
R
C
F
4
C
F
C
C
F
0
C
C
F
2
C
C
F
1
C
C
C
F
3
PCA Interrupt
0
1
PCA0CPMn
C
A
P
P
n
n
E
C
O
M
n
E
C
C
F
n
T
O
G
n
P
W
M
n
C
A
P
N
M
A
T
n
0 0
0 x
CEXn
Crossbar
Port I/O
Toggle
ENB
ENB
0
1
Write to
PCA0CPLn
Reset
Write to
PCA0CPHn
0
1
TOGn
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