Hello all, I need Your help, I'm not able to enable the internal XRAM2 of the device in object. Someone of you have some example code to do that ? I have tried to make some addressings but when I write into the XRAM2 the microcontroller hang-up. Thanks in advance, Regards, Davide Clementelli.
Davide, Describe exactly what you are doing. Otherwise no one will be able to help you.
The XRAM is divided into 2 areas, the first 2K Bytes named XRAM1 and the second
8K Bytes named XRAM2, connected to the internal XBUS and are accessed like an external memory in 16-bit demultiplexed bus-mode without wait state or read/write delay (50ns access at 40MHz CPU clock). Byte and Word accesses are allowed.The XRAM2 address range is 00'C000h
- 00'DFFFh if XPEN (bit 2 of SYSCON register), and XRAM2 (bit 3 of XPERCON register are set). If bit XRAM2EN or XPEN is cleared, then any access in the address range 00'C000h
- 00'DFFFh will be directed to external memory interface, using the BUSCONx register corresponding to address matching ADDRSELx register.
Did you set ADDRSEL properly ?
- The default XPER selection after Reset is identical to XBUS configuration of ST10C167: XCAN1 is enabled, XCAN2 is disabled, XRAM1 (2K Byte compatible XRAM) is enabled, XRAM2 (new 8K Byte XRAM) is disabled.
- The register XPERCON cannot be changed after the global enabling of XPeripherals, i.e. after the setting of bit XPEN in the SYSCON register.
How do ou access memory ? Do you use word access or byte access ?
grtnx /jan
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