参数资料
型号: C8051F002R
厂商: Silicon Laboratories Inc
文件页数: 68/171页
文件大小: 0K
描述: IC 8051 MCU 32K FLASH 32LQFP
标准包装: 1
系列: C8051F00x
核心处理器: 8051
芯体尺寸: 8-位
速度: 20MHz
连通性: SMBus(2 线/I²C),SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 8
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 3.6 V
数据转换器: A/D 4x12b; D/A 2x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 32-LQFP
包装: 剪切带 (CT)
其它名称: 336-1002-1
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
1.4.
Programmable Digital I/O and Crossbar
The standard 8051 Ports (0, 1, 2, and 3) are available on the MCUs.
All four ports are pinned out on the
F000/05/10/15.
Ports 0 and 1 are pinned out on the F001/06/11/16, and only Port 0 is pinned out on the
F002/07/12/17. The Ports not pinned out are still available for software use as general purpose registers. The Port
I/O behave like the standard 8051 with a few enhancements.
Each Port I/O pin can be configured as either a push-pull or open-drain output. Also, the “weak pull-ups” which are
normally fixed on an 8051 can be globally disabled, providing additional power saving capabilities for low power
applications.
Perhaps the most unique enhancement is the Digital Crossbar. This is essentially a large digital switching network
that allows mapping of internal digital system resources to Port I/O pins on P0, P1, and P2. (See Figure 1.8.)
Unlike microcontrollers with standard multiplexed digital I/O, all combinations of functions are supported.
The on-board counter/timers, serial buses, HW interrupts, ADC Start of Conversion input, comparator outputs, and
other digital signals in the controller can be configured to appear on the Port I/O pins specified in the Crossbar
Control registers. This allows the user to select the exact mix of general purpose Port I/O and digital resources
needed for his particular application.
Figure 1.8. Digital Crossbar Diagram
XBR0, XBR1,
XBR2 Registers
PRT3CF
Register
External
Pins
P0
P1
P2
8
(I
nt
ernal
Di
git
a
lSi
gnals)
Port
Latches
P3
I/O
Cells
P3.0
Digital
Crossbar
Priority
Decoder
P1
I/O
Cells
SMBus
2
SPI
4
UART
2
PCA
6
T0, T1,
T2
6
SYSCLK
CNVSTR
P3.7
P1.0
P1.7
P2
I/O
Cells
P2.0
P2.7
P0
I/O
Cells
P0.0
P0.7
8
Highest
Priority
Lowest
Priority
Highest
Priority
Lowest
Priority
8
(P2.0-P2.7)
(P1.0-P1.7)
(P0.0-P0.7)
8
PRT0CF, PRT1CF,
PRT2CF Registers
(P3.0-P3.7)
Comptr.
Outputs
2
Rev. 1.7
16
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