参数资料
型号: TOOLSTICK300DC
厂商: Silicon Laboratories Inc
文件页数: 8/178页
文件大小: 0K
描述: TOOLSTICK DAUGHTER CARD
标准包装: 1
系列: ToolStick
类型: MCU
适用于相关产品: C8051F300
所含物品: 子卡
Rev. 2.9
105
C8051F300/1/2/3/4/5
Figure 12.4. Crossbar Priority Decoder with XBR0 = 0x44
Registers XBR1 and XBR2 are used to assign the digital I/O resources to the physical I/O Port pins. Note
that when the SMBus is selected, the Crossbar assigns both pins associated with the SMBus (SDA and
SCL). Either or both of the UART signals may be selected by the Crossbar. UART0 pin assignments are
fixed for bootloading purposes: when UART TX0 is selected, it is always assigned to P0.4; when UART
RX0 is selected, it is always assigned to P0.5. Standard Port I/Os appear contiguously after the prioritized
functions have been assigned. For example, if assigned functions that take the first 3 Port I/O (P0.[2:0]), 5
Port I/O are left for analog or GPIO use.
VREF
x1
x2
CNVSTR
01
2345
67
00
1000
10
Port pin potentially available to peripheral
Port pin skipped by CrossBar
S
igna
ls
U
na
v
a
il
a
bl
e
RX0
SDA
SCL
CP0
CEX0
CEX1
Special Function Signals are not assigned by the crossbar. When
these signals are enabled, the CrossBar must be manually
configured to skip their corresponding port pins. Note: x1 refers to
the XTAL1 signal; x2 refers to the XTAL2 signal.
SF Signals
CEX2
ECI
CP0A
SYSCLK
P0
XBR0[0:7]
T0
T1
SF Signals
PIN I/O
TX0
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