How to read & write to a 25aa1024 (1 Mbit SPI Bus Serial EEPROM) via 16F88

[wolwil]

I changed the Control Byte for the read and the write from this:

contR    CON     %10100001                  
contW    CON     %10100000

to this:

contR    CON     %10100011                  
contW    CON     %10100010

Thinking that because A2 is held high for it to operate then the control bit for A2 should also be a 1... here is the new code:

DEFINE I2C_SLOW 1
SO      con     0                           ' Define serial output pin
T2400   con     0                           ' Define serial mode
contR    CON     %10100011                   ' Define Control byte
contW    CON     %10100010                   ' Define Control byte
addr    CON     %0000000000000111           ' 2 Byte Address of 7
addr2   CON     %0000000000001000           ' 2 Byte Address of 8
D1      CON     %00000111
B0      VAR     BYTE                        ' Var for data being read
B1      VAR     BYTE                        ' Var for data being read

B0 = 0
B1 = 0
I2CWRITE PORTB.1,PORTB.4,contW,addr,[D1]      ' Send the byte 1 to address 7

PAUSE 10                                    ' Wait 10ms for write to complete

I2CREAD PORTB.1,PORTB.4,contR,addr,[B1]      ' Read address 7 into B1
I2CREAD PORTB.1,PORTB.4,contR,addr2,[B0]      ' Read address 8 into B0

Serout SO,T2400,["Addr",#addr,":",#B1," and then Addr",#addr2,":",#B0,13,10] ' Print B1's Value in DEC

this is the output from hyperterm:

Addr7:2 and then 2

Like I said I don't know what it means but it sure is different then what I was getting.

Any thoughts as to why it now is reading a "2" and not 255 or 0??? Its almost like it read the last 2 bits of the write control byte as if the write command wrote the last 2 bits of the control byte to the EEPROM.


UPDATE:
I just switched the control byte to be:

contR    CON     %10100001                  
contW    CON     %10100010

and got this as an output (Note the "6" in Address 8 to begin and then it get over written to "255" the next go around):

Addr7:2 and then Addr8:6
Addr7:2 and then Addr8:255
Addr7:2 and then Addr8:255
Addr7:2 and then Addr8:255
Addr7:2 and then Addr8:255

also I know I'm writing to it because in the example output above I read address 6 with it too (not shown in the code but I added it after posting) and I was reading "255" every time. So this tells me that I am writing a "6" to address 8 but then on the second loop it gets over written/erased to "255" but the "2" in address 7 remains constant and in memory. Now keep in mind that no where in my code do I try to write to address 8 it just happens, more than likely from an over flow from the write to address 7. So basically the byte I am trying to write to 7 gets split into a "2" in address 7 and a "6" in address 8 then address 8 gets overwritten on the 2nd loop to a "255".

and when I do the control byte like this:

contR    CON     %10100011                  
contW    CON     %10100000

I get this (the same as having both A2 bits set to 1):

Addr7:2 and then Addr8:2
Addr7:2 and then Addr8:2
Addr7:2 and then Addr8:2