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本文作者:立创开源硬件平台 OSHWHub 用户@BH2VGM,禁止商用,未经许可禁止转载,点击查看原文章
1、工程描述
02、1972年英特尔发布了8008 CPU。它是一款单芯片的TTL电平兼容PMOS工艺8位处理器,采用冯架构,寻址能力16KB。它被认为是现代x86架构的起源。
03、1974年英特尔8080 CPU问世。
它改进了8008的一些问题,将直接寻址空间扩大到64KB。增加了中断处理机制,且拥有了寄存器对操作能力,一次可以转移或者向数据栈操作16位二进制数。它的指针栈和数据栈全部转移到外部的RAM里,栈基地址由SP寄存器寻址。发展到8086之后变成了数据、堆栈、代码、辅助四个基地址 指针 寄存器。
就是这款CPU,为后来的8080总线协议打下基础,该总线形式一直沿用到8085,8086等CPU。值得注意的是,它的寄存器堆上有W和Z,这两个只是中转寄存器,用于复杂指令过程中的暂存,不对程序暴露。
3、设计特点
一般可以使用INTEL 8212 锁存器,配合一些逻辑门和三态门,完成控制总线的复用,以及数据总线的驱动。
如下图所示:
更多详情及附件,可从原工程查看。
本文作者:立创开源硬件平台 OSHWHub 用户@BH2VGM,禁止商用,未经许可禁止转载
STM32L051C8T6/单片机(MCU/MPU/SOC) | 6.15 | |
AD9834BRUZ-REEL/直接数字频率合成(DDS) | 34.29 | |
LMC6482AIMX/NOPB/精密运放 | 1.86 | |
SN65HVD231DR/CAN收发器 | 3.85 | |
ADM3251EARWZ-REEL/隔离式RS-232收发器 | 12.14 | |
TLV62569DBVR/DC-DC电源芯片 | 0.1954 | |
MAX3232ESE+T/RS232芯片 | 4 | |
ISO1050DUBR/隔离式CAN收发器 | 2.05 | |
OPA2188AIDR/精密运放 | 2.11 | |
STM8L051F3P6TR/单片机(MCU/MPU/SOC) | 2.1 |
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