參數(shù)資料
型號： C8051F300-TB
廠商： Silicon Laboratories Inc
文件頁數(shù)： 64/178頁
文件大?。?/td> 0K
描述： BOARD PROTOTYPING W/C8051F300
標準包裝： 1
類型： MCU
適用于相關(guān)產(chǎn)品： C8051F300
所含物品： 板
C8051F300/1/2/3/4/5
156
Rev. 2.9
16.1. PCA Counter/Timer
The 16-bit PCA counter/timer consists of two 8-bit SFRs: PCA0L and PCA0H. PCA0H is the high byte
(MSB) of the 16-bit counter/timer and PCA0L is the low byte (LSB). Reading PCA0L automatically latches
the value of PCA0H into a “snapshot” register; the following PCA0H read accesses this “snapshot” register.
Reading the PCA0L Register first guarantees an accurate reading of the entire 16-bit PCA0 counter.
Reading PCA0H or PCA0L does not disturb the counter operation. The CPS2-CPS0 bits in the PCA0MD
register select the timebase for the counter/timer as shown in Table 16.1. Note that in ‘External oscillator
source divided by 8’ mode, the external oscillator source is synchronized with the system clock,
and must have a frequency less than or equal to the system clock.
When the counter/timer overflows from 0xFFFF to 0x0000, the Counter Overflow Flag (CF) in PCA0MD is
set to logic 1 and an interrupt request is generated if CF interrupts are enabled. Setting the ECF bit in
PCA0MD to logic 1 enables the CF flag to generate an interrupt request. The CF bit is not automatically
cleared by hardware when the CPU vectors to the interrupt service routine, and must be cleared by soft-
ware (Note: PCA0 interrupts must be globally enabled before CF interrupts are recognized. PCA0 inter-
rupts are globally enabled by setting the EA bit and the EPCA0 bit to logic 1). Clearing the CIDL bit in the
PCA0MD register allows the PCA to continue normal operation while the CPU is in Idle mode.
Table 16.1. PCA Timebase Input Options
CPS2
CPS1
CPS0
Timebase
0
System clock divided by 12
0
1
System clock divided by 4
0
1
0
Timer 0 overflow
0
1
High-to-low transitions on ECI (max rate = system clock divided by 4)
1
0
System clock
1
0
1
External oscillator source divided by 8*
*Note: External oscillator source divided by 8 is synchronized with the system clock.
PCA0CN
C
F
C
R
C
F
0
C
F
2
C
F
1
SYSCLK/12
SYSCLK/4
Timer 0 Overflow
ECI
000
001
010
011
PCA0MD
C
I
D
L
W
D
T
E
C
F
C
P
S
1
C
P
S
0
W
D
L
C
K
C
P
S
2
IDLE
0
1
100
101
SYSCLK
External Clock/8
PCA0H
PCA0L
Snapshot
Register
To SFR Bus
Overflow
To PCA Interrupt System
CF
PCA0L
read
To PCA Modules
Figure 16.2. PCA Counter/Timer Block Diagram
相關(guān)PDF資料
PDF描述
0210391037 CABLE JUMPER 1MM .102M 33POS
C8051F226-TB BOARD PROTOTYPING W/C8051F226
C8051F330-TB BOARD PROTOTYPING W/C8051F330
LGU2G101MELA CAP ALUM 100UF 400V 20% SNAP
SDR-Q SCOTCH CODE REFILL Q
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
C8051F300-TB-K 功能描述:BOARD PROTOTYPING W/C8051F300 制造商:silicon labs 系列:- 零件狀態(tài):在售 板類型:評估平臺 類型:MCU 8-位 核心處理器:8051 操作系統(tǒng):- 平臺:- 配套使用產(chǎn)品/相關(guān)產(chǎn)品:C8051F30x 安裝類型:固定 內(nèi)容:板 標準包裝:1
C8051F301 功能描述:8位微控制器 -MCU 8KB 2%osc RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F301-GM 功能描述:8位微控制器 -MCU 8KB 11P MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F301-GMR 功能描述:8位微控制器 -MCU 8KB 11P MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
C8051F301-GS 功能描述:8位微控制器 -MCU 8KB Flash 2%osc RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*