at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 252

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

22.6.2
Register Name:
Access Type:
Reset Value:
• COUNT: SDRAMC Refresh Timer Count
This 12-bit field is loaded into a timer that generates the refresh pulse. Each time the refresh pulse is generated, a refresh
burst is initiated. The value to be loaded depends on the SDRAMC clock frequency (MCK: Master Clock), the refresh rate
of the SDRAM device and the refresh burst length where 15.6 µs per row is a typical value for a burst of length one.
To refresh the SDRAM device, this 12-bit field must be written. If this condition is not satisfied, no refresh command is
issued and no refresh of the SDRAM device is carried out.
252
31
23
15
–
–
–
7
AT91SAM9263 Preliminary
SDRAMC Refresh Timer Register
30
22
14
SDRAMC_TR
Read/Write
0x00000000
–
–
–
6
29
21
13
–
–
–
5
28
20
12
–
–
–
4
COUNT
27
19
11
–
–
3
26
18
10
–
–
2
COUNT
25
17
–
–
9
1
6249D–ATARM–20-Dec-07
24
16
–
–
8
0