Zilog Z8F0130 - Manual (Page 265)

UM013037-1212 Zilog Extensions to the C Library Functions
Zilog Developer Studio II – Z8 Encore!
User Manual
241
void main()

{
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INIT_FLASH(_DEFFREQ); /* Target clock frequency */
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WRITE_NVDS(x, 0x10); /* write x to NVDS at address 0x10 */
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x = READ_NVDS(0x10); /* read NVDS at address 0x10 */

}
_DEFFREQ is automatically set from the IDE based on the clock frequency setting in the
Configure Target dialog box.
WRITE_NVDS_GET_STATUS
The WRITE_NVDS_GET_STATUS function is a Zilog function that writes a value to
NVDS memory at the specified address and gets the status.
Synopsis
#include

char reentrant WRITE_NVDS_GET_STATUS(char value, char addr);

char reentrant nvds_write_get_status (char value, char addr);
Returns
The function returns the status of NVDS write as per the device specification.
Example
#include
char x, wstatus, rstatus;
unsigned int val;
void main()
{
wstatus = WRITE_NVDS_GET_STATUS(x, 0x10);

/* write x to NVDS at address 0x10, and get the status */
val = READ_NVDS_GET_STATUS(0x10); /* read NVDS at address 0x10 */
x = (val >> 8) & 0xFF; /* extract data */
rstatus = val & 0xFF; /* extract read status */
}
Zilog Extensions to the C Library Functions
In addition to the Zilog run-time functions above, the run-time library provides specialized
versions of most of the standard library functions to allow pointer parameters to be in near