1 bit 2^1 =2 =2h 2 bit 2^2 =4 =4h 3 bit 2^3 =8 =8h 4 bit 2^4 =16 =10h 5 bit 2^5 =32 =20h 6 bit 2^6 =64 =40h 7 bit 2^7 =128 =80h 8 bit 2^8 =256 =100h 9 bit 2^9 =512 =200h 10 bit 2^10 =1024 =400h 11 bit 2^11 =2048 =800h 12 bit 2^12 =4096 =1000h 13 bit 2^13 =8192 =2000h 14 bit 2^14 =16384 =4000h these are the number of combinations, 0 included this gives 3FFFh as a maximum number Peter -----Original Message----- From: Francesco Cembrola To: PICLIST@MITVMA.MIT.EDU Date: Tuesday, December 23, 1997 6:17 PM Subject: 14 bits and only 3FFF I am a little confused. I have just read the programming data sheet for the 16C84 where it states that when you read the retrieved data from the program memory it is in a 14-bit format. However if I read an empty PIC the word is 3FFF which requires only 13 bits. A 14-bit word would give me a maximum of 7FFF. Can sombody explain this please? Have a happy Christmas