参数资料
型号: PIC16F74T-I/L
厂商: Microchip Technology
文件页数: 55/104页
文件大小: 0K
描述: IC MCU FLASH 4KX14 A/D 44PLCC
产品培训模块: Asynchronous Stimulus
标准包装: 500
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 33
程序存储器容量: 7KB(4K x 14)
程序存储器类型: 闪存
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 8x8b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 带卷 (TR)
Micrel, Inc.
KSZ8851-16MLLJ
March 2010
46
M9999-030210-1.0
Host MAC Address Registers: MARL, MARM and MARH
These Host MAC address registers are loaded starting at word location 0x1 of the EEPROM upon hardware reset. The
software driver can read or write these registers value, but it will not modify the original Host MAC address value in the
EEPROM. These six bytes of Host MAC address in external EEPROM are loaded to these three registers as mapping
below:
MARL[15:0] = EEPROM 0x1(MAC Byte 2 and 1)
MARM[15:0] = EEPROM 0x2(MAC Byte 4 and 3)
MARH[15:0] = EEPROM 0x3(MAC Byte 6 and 5)
The Host MAC address is used to define the individual destination address that the KSZ8851-16MLLJ responds to when
receiving frames. Network addresses are generally expressed in the form of 01:23:45:67:89:AB, where the bytes are
received from left to right, and the bits within each byte are received from right to left (LSB to MSB). For example, the
actual transmitted and received bits are on the order of 10000000 11000100 10100010 11100110 10010001 11010101.
These three registers value for Host MAC address 01:23:45:67:89:AB will be held as below:
MARL[15:0] = 0x89AB
MARM[15:0] = 0x4567
MARH[15:0] = 0x0123
Host MAC Address Register Low (0x10 – 0x11): MARL
The following table shows the register bit fields for Low word of Host MAC address.
Bit
Default Value
R/W
Description
15-0
-
RW
MARL MAC Address Low
The least significant word of the MAC address.
Host MAC Address Register Middle (0x12 – 0x13): MARM
The following table shows the register bit fields for middle word of Host MAC address.
Bit
Default Value
R/W
Description
15-0
-
RW
MARM MAC Address Middle
The middle word of the MAC address.
Host MAC Address Register High (0x14 – 0x15): MARH
The following table shows the register bit fields for high word of Host MAC address.
Bit
Default Value
R/W
Description
15-0
-
RW
MARH MAC Address High
The Most significant word of the MAC address.
0x16 – 0x1F: Reserved
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