In SX Microcontrollers, SX/B Compiler and SX-Key Tool, inaki wrote:

Here is my code. By the way, I have checked that SHIFTOUT is working as expected testing the signals in pins CS, SCK and SI. When reading, signal SO stays flat however.

'The following code is intended to write a $5A byte on address zero and then read it back.

'I am using a FM25640 Ramtron chip (8KB, 5Mhz)

CS VAR  RC.0
SCK VAR RC.3
SI VAR RC.2
SO VAR RC.1
MyData VAR byte

TRIS_C = %00000010
 
 CS = 0
 SHIFTOUT SI, SCK, MSBFIRST, 6  'W-ENABLE
 CS = 1 

'WRITE a byte on address zero
 CS = 0
 SHIFTOUT SI, SCK, MSBFIRST, 2  'WRITE
 SHIFTOUT SI, SCK, MSBFIRST, 0  'adr high
 SHIFTOUT SI, SCK, MSBFIRST, 0  'adr low
 SHIFTOUT SI, SCK, MSBFIRST, $5A  'data
 CS = 1

'READ address zero
 CS = 0
 SHIFTOUT SI, SCK, MSBFIRST, 3  'READ
 SHIFTOUT SI, SCK, MSBFIRST, 0  'adr high
 SHIFTOUT SI, SCK, MSBFIRST, 0  'adr low
 SHIFTIN  SO, SCK, MSBPRE, MyData
 CS = 1
 
 end

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