C8051F410DK Silicon Laboratories Inc, C8051F410DK Datasheet - Page 188
C8051F410DK
Manufacturer Part Number
C8051F410DK
Description
KIT DEV FOR C8051F41X
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F410DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F41x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F410
Silicon Family Name
C8051F41x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051F41x
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1314
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F410DK
Manufacturer:
Silicon Labs
Quantity:
135
- Current page: 188 of 270
- Download datasheet (2Mb)
C8051F410/1/2/3
Reads and writes of RAMDATA load the value at address RAMADDR into RTC0DAT. The following exam-
ple writes 0xA5 to address 0x20 in the RAM and reads the value back to a temporary variable:
// in 'C':
unsigned char temp = 0x00;
// Unlock the smaRTClock interface
RTC0KEY = 0xA5;
RTC0KEY = 0xF1;
// Enable the smaRTClock
RTC0ADR = 0x06; // address the RTC0CN register
RTC0DAT = 0x80; // enable the smaRTClock
while ((RTC0ADR & 0x80) == 0x80);
// Write to the smaRTClock RAM
RTC0ADR = 0x0E;// address the RAMADDR register
RTC0DAT = 0x20;// write the address of 0x20 to RAMADDR
while ((RTC0ADR & 0x80) == 0x80);// poll on the BUSY bit
RTC0ADR = 0x0F;// address the RAMDATA register
RTC0DAT = 0xA5;// write 0xA5 to RAM address 0x20
while ((RTC0ADR & 0x80) == 0x80);
// Read from the smaRTClock RAM
RTC0ADR = 0x0E;// address the RAMADDR register
RTC0DAT = 0x20;// write the address of 0x20 to RAMADDR
while ((RTC0ADR & 0x80) == 0x80);
RTC0ADR = 0x0F;
RTC0ADR |= 0x80; // initiate a read of the RAMDATA register
while ((RTC0ADR & 0x80) == 0x80);
temp = RTC0DAT; // read the value of RAM address 0x20
; in assembly:
188
Bit 7:
Internal Register Definition 20.9. RAMDATA: smaRTClock Backup RAM Data
; Unlock the smaRTClock interface
mov RTC0KEY, #0A5h
mov RTC0KEY, #0F1h
R/W
Bit7
Note: This register is not an SFR. It can only be accessed indirectly through RTC0ADR and RTC0DAT.
RAMDATA: smaRTClock Battery Backup RAM Data Bits.
These bits provide read and write access to the smaRTClock Backup RAM byte that is
selected by RAMADDR.
R/W
Bit6
// address the RAMDATA register
R/W
Bit5
R/W
Bit4
// poll on the BUSY bit
// poll on the BUSY bit
// poll on the BUSY bit
// poll on the BUSY bit
Rev. 1.1
R/W
Bit3
R/W
Bit2
R/W
Bit1
R/W
Bit0
smaRTClock
00000000
Reset Value
Address:
0x0F
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