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TEMPCOMPRTC-RD
A PPENDIX A—TC-RTC: S UPPORTED C OMMANDS
TC-RTC Firmware with UART Interface
The TC-RTC firmware with UART interface supports a set of commands to read/write date and time. The
supported commands along with explanations are listed below:
s – Toggles auto-display mode that displays time once every second.
r xx yy – Read yy bytes starting at address xx.
w xx yy data – Write yy bytes starting at address xx.
Notes:
1. The commands are case-sensitive. Only lower-case letters are accepted.
2. The addresses should be in decimal format (e.g., address 0x1F is entered as 31).
3. See “Appendix B—TC-RTC: Implementation Details” for information on how the RTC register data is formatted.
Write Command Examples
Date/Time: 11:05:39 AM, Saturday, December, 08, 1979 → 39 05 51 06 08 12 79
w000739055106081279
Time: 21: 48: 22 → 22 48 21
w0003224821
Day: Tuesday → 02
w030102
NVRAM data write: 01 02 03 starting at address 0x1F (31) → 31 01 02 03
w3103010203
Read Command Examples
Date/Time: r0007
NVRAM (all 56 bytes): r0856
NVRAM (4 bytes starting at address 26): r2604
TC-RTC Firmware with SMBus Interface
The TC-RTC firmware with the SMBus interface implements a SMBus Slave device with a Slave Address of 0xD0.
The device operates in one of two modes: Slave Receiver Mode or Slave Transmitter Mode. In Slave Receiver
Mode, it receives address and data from the Master and writes it to the RTC or NVRAM registers. In Slave
Transmitter Mode, it sends data from the RTC or NVRAM registers to the Master. Refer to "AN293: Temperature
Compensated Real Time Clock Reference Design Programmer's Guide" for more details on the SMBus interface
implementation.
Rev. 0.1
11
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