參數(shù)資料
型號: C8051F305-GS
廠商: Silicon Laboratories Inc
文件頁數(shù): 11/178頁
文件大小: 0K
描述: IC 8051 MCU 2K FLASH 14-SOIC
產(chǎn)品培訓模塊: Serial Communication Overview
標準包裝: 56
系列: C8051F30x
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 8
程序存儲器容量: 2KB(2K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
包裝: 管件
產(chǎn)品目錄頁面: 622 (CN2011-ZH PDF)
配用: 336-1444-ND - ADAPTER PROGRAM TOOLSTICK F300
其它名稱: 336-1540-5
C8051F300/1/2/3/4/5
108
Rev. 2.9
SFR Definition 12.3. XBR2: Port I/O Crossbar Register 2
12.3. General Purpose Port I/O
Port pins that remain unassigned by the Crossbar and are not used by analog peripherals can be used for
general purpose I/O. Port0 is accessed through a corresponding special function register (SFR) that is
both byte addressable and bit addressable. When writing to a Port, the value written to the SFR is latched
to maintain the output data value at each pin. When reading, the logic levels of the Port's input pins are
returned regardless of the XBRn settings (i.e., even when the pin is assigned to another signal by the
Crossbar, the Port register can always read its corresponding Port I/O pin). The exception to this is the
execution of the read-modify-write instructions. The read-modify-write instructions when operating on a
Port SFR are the following: ANL, ORL, XRL, JBC, CPL, INC, DEC, DJNZ and MOV, CLR or SET, when the
destination is an individual bit in a Port SFR. For these instructions, the value of the register (not the pin) is
read, modified, and written back to the SFR.
Bit7:
WEAKPUD: Port I/O Weak Pull-up Disable.
0: Weak Pull-ups enabled (except for Ports whose I/O are configured as push-pull).
1: Weak Pull-ups disabled.
Bit6:
XBARE: Crossbar Enable.
0: Crossbar disabled.
1: Crossbar enabled.
Bits5–3: UNUSED: Read = 000b. Write = don’t care.
Bit2:
T1E: T1 Enable.
0: T1 unavailable at Port pin.
1: T1 routed to Port pin.
Bit1:
T0E: T0 Enable.
0: T0 unavailable at Port pin.
1: T0 routed to Port pin.
Bit0:
ECIE: PCA0 Counter Input Enable.
0: ECI unavailable at Port pin.
1: ECI routed to Port pin.
R/W
Reset Value
WEAKPUD
XBARE
T1E
T0E
ECIE
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address:
0xE3
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