Zilog Z8F0130 - Manual (Page 259)

UM013037-1212 Zilog Functions
Zilog Developer Studio II – Z8 Encore!
User Manual
235
Example
#include

char x;

void main()

{

INIT_FLASH(_DEFFREQ); /* Target clock frequency */

WRITE_NVDS(x, 0x10); /* write x to NVDS at address 0x10 */

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.
READ_NVDS_GET_STATUS
The READ_NVDS_GET_STATUS function is a Zilog function that reads a value from
NVDS memory at the specified address and gets the status.
Synopsis
#include

int reentrant READ_NVDS_GET_STATUS(char addr);

int reentrant nvds_read_get_status (char addr);
Returns
The function returns the value read and the status of NVDS read as per the device specifi-
cation. The status is in the lower byte of the return value. The upper byte of the return
value contains the data read.
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 */
}