observations from looking at schematics, pinouts of the 8051(dip) and the 800-DIP'
and notes from the product data sheet -LPC82X
ALL BUT 1 PIN appear to be 5v tolerant per the notes [in digital mode assignments]
default is INPUT with PU on most pins
a) 800DIP PIO0_6 [800/8051 pin 7-(port1.6)] is 3.3V ONLY
- possibly an output??
b) the 8051 xtal pins 18 & 19 need to be isolated from the 800-DIP
??cut off the 800DIP pins??
c) duplicate pins !!
800/8051 pin 6,9 RESET has 10k pullup & switch to GND
800/8051 pin 5,11 [824 PIO0_4 TXD/ USB]
800/8051 pin 18,27 [XTAL & A14]
800/8051 pin 19,28 [XTAL & A15]
800/8051 pin 12,32 [8051 INT0* & AD7]
**edit 800/8051 pin 1,10 [10 is RXD for both, but pin 1 is..]
d) 800/8051 pins 25,26 no pullups, will float as these are open-drain always
used as Address lines - will need pullups!!
e) 800/8051 pins 21,39,38 (A8,AD0,AD1 -8051-speak) have LEDs
f) 800/8051 pin 24 (A11 -8051-speak) has 10K pullup & switch to GND
[ISP mode switch for the 824 chip]
g) 800/8051 pin 3 has a 10K pullup
h) 800/8051 pin 4 has a 10K PULLDOWN
j) 800/8051 pins 29,30 will need to be jumpered to ....???
used for addressing external memory/devices in the 8051 circuitry
k) 800/8051 pin 31 - should not be a concern - this tells the 8051 to use
external memory - program and data
Code: Select all
* * * * SO, WE ARE LEFT WITH:
m) 800/8051 pins 2,3,4,8, and possibly 7
two will need to be assigned to the PSEN & ALE if this 800-DIP is being
put into an existing 8051 circuit;
WATCH out for existing connections to these pins !!!
HAPPY PROJECTS and PROGRAMMING