| Rob Stoffels 06/10/09 05:25 Read: 344 times Westerlo Belgium |
#165976 - No, think it's keil compiler Responding to: David Prentice's previous message |
Flip is not the problem, cause when i replace the PA=0x55 part with P0=0x55 flip flashes the µc without any problem...
The AT89c51cc01 has onchip XRAM datasheet said:
Bit 1: Internal/External RAM (00h - FFh) access using MOVX @ Ri/@ DPTR 0 - Internal XRAM access using MOVX @ Ri/@ DPTR. 1 - External data memory access. bit O: Disable/Enable ALE) 0 - ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if X2 mode is used) 1 - ALE is active only during a MOVX or MOVC instruction. I think there is something that needs to be configured in the keil linker, object or assembler file(s) to indicate the use of XDATA (XRAM, far). Wiring and understanding how the communication between µc and external ram is clear. |
