cop8sgr5vej8xxx National Semiconductor Corporation, cop8sgr5vej8xxx Datasheet - Page 15

• Manufacturer Part Number: cop8sgr5vej8xxx
• Description: 8-bit Cmos Rom Based And Otp Microcontrollers With 8k To 32k Memory, Two Comparators And Usart
• Manufacturer: National Semiconductor Corporation

4.0 Pin Descriptions
Note: For compatibility with existing software written for COP888xG devices
Port D is an 8-bit output port that is preset high when RESET
goes low. The user can tie two or more D port outputs
(except D2) together in order to get a higher drive.
Note: Care must be exercised with the D2 pin operation. At RESET, the
and with existing Mask ROM devices, a read of the Port I input pins
(address xxD7) will return the same data as reading the Port F input
pins (address xx96). It is recommended new applications which will go
to production with the COP8SGx use the Port F addresses. Note that
compatible ROM devices contains the input only Port I instead of the
bi-directional Port F.
external loads on this pin must ensure that the output voltages stay
above 0.7 V
keep the external loading on D2 to less than 1000 pF.
FIGURE 4. I/O Port Configurations
CC
to prevent the chip from entering special modes. Also
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FIGURE 5. I/O Port Configurations — Output Mode
FIGURE 6. I/O Port Configurations — Input Mode
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