参数资料
型号: MC68EN302CPV20BT
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
封装: 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-144
文件页数: 128/128页
文件大小: 641K
代理商: MC68EN302CPV20BT
IEEE 1149.1 (JTAG) Test Access Port
7-14
MOTOROLA
7.4.4 CLAMP
The CLAMP instruction selects the single-bit bypass register as shown in Figure 7-11, and
the state of all signals driven from system output pins is completely defined by the data pre-
viously shifted into the boundary scan register (for example, using the SAMPLE/PRELOAD
instruction).
7.4.5 HI-Z
The HI-Z instruction is provided as a manufacturer’s optional public instruction to prevent
having to backdrive the output pins during circuit-board testing. When HI-Z is invoked, all
output drivers are turned off (i.e., high impedance). The instruction selects the bypass reg-
ister.
NOTE
On the MC68EN302, the THREESTATE pin may also be used
during system reset to perform the same function.
7.5 MC68EN302 RESTRICTIONS
The control afforded by the output enable signals using the boundary scan register and the
EXTEST instruction requires a compatible circuit-board test environment to avoid device-
destructive configurations. The user must avoid situations in which the MC68EN302 output
drivers are enabled into actively driven networks.
7.6 NON-SCAN CHAIN OPERATION
In non-scan chain operation, there are two constraints. First, the TCK input does not include
an internal pullup resistor and should not be left unconnected to preclude mid-level inputs.
The second constraint is to ensure that the scan chain test logic is kept transparent to the
system logic by forcing TAP into the test-logic-reset controller state. This is accomplished
by asserting the TRST signal during system reset (RESET and HALT asserted) and leaving
TMS unconnected or tied to VCC.
相关PDF资料
PDF描述
MC68302FC20CR2 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132
MC68302FC16CR2 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132
MC68LC302PU20CT 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP100
MC68EN302PV25BT 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
MC68302PV33C 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
相关代理商/技术参数
参数描述
MC68EN302PV20 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Integrated Multiprotocol Processor with Ethernet
MC68EN302PV20BT 功能描述:IC MPU MULTI-PROTOCOL 144-LQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:M683xx 标准包装:2 系列:MPC8xx 处理器类型:32-位 MPC8xx PowerQUICC 特点:- 速度:133MHz 电压:3.3V 安装类型:表面贴装 封装/外壳:357-BBGA 供应商设备封装:357-PBGA(25x25) 包装:托盘
MC68EN302PV25 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Integrated Multiprotocol Processor with Ethernet
MC68EN302PV25BT 功能描述:IC MPU MULTI-PROTOCOL 144-LQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:M683xx 标准包装:2 系列:MPC8xx 处理器类型:32-位 MPC8xx PowerQUICC 特点:- 速度:133MHz 电压:3.3V 安装类型:表面贴装 封装/外壳:357-BBGA 供应商设备封装:357-PBGA(25x25) 包装:托盘
MC68EN360AI25L 功能描述:微处理器 - MPU QUICC ETHRN RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324