参数资料
型号: MC68HC08AS20VFNR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PQCC52
封装: PLASTIC, LCC-52
文件页数: 52/96页
文件大小: 3243K
代理商: MC68HC08AS20VFNR2
6
MOTOROLA
6-4
MC68HC05E0
PARALLEL INPUT/OUTPUT PORTS
6.3
Port D Alternate Functions
All Port D lines can be recongured to provide the signals needed to interface with external
memory (see Table 6-1).
R/W is the Read/Write signal which is active low only during the high phase of P02 and stays high
during the low phase of P02.
The chip select signals CS2 and CS3 are active low and are only active during the high phase of
P02.
LIR is an output signal which goes low only during the first P02 clock cycle of each instruction, and
remains low for the duration of that cycle. It is intended for use during debugging and emulation.
Figure 6-2 Port C Wake-up Function
Wake-up
Phase Register
($0014)
IRQB
INTX
Real Time
Interrupt
WAKF
Wake-up
Enable Register
($0013)
8
56
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