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MCP795W21 Datenblatt(PDF) 7 Page - Microchip Technology |
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MCP795W21 Datenblatt(HTML) 7 Page - Microchip Technology |
7 / 54 page 2011-2012 Microchip Technology Inc. Preliminary DS22280C-page 7 MCP795W1X/MCP795W2X 2.11 RTCC Memory Map The RTCC registers are contained in addresses 0x00h- 0x1fh. 64 bytes of user-accessable SRAM are located in the address range 0x20-0x5f. The SRAM memory is a separate block from the RTCC control and Configura- tion registers. All SRAM locations are battery-backed- up during a VCC power fail. Unused locations are not accessible. • Addresses 0x00h-0x07h are the RTCC Time and Date registers. These are read/write registers. Care must be taken when writing to these registers with the oscillator running. • Incorrect data can appear in the Time and Date registers if a write is attempted during the time frame where these internal registers are being incremented. The user can minimize the likelihood of data corruption by ensuring that any writes to the Time and Date registers occur before the contents of the second register reach a value of 0x59H. • Addresses 0x08h-0x0Bh are the device Configu- ration, Calibration, Watchdog Configuration and Event Detect Configuration registers. • Addresses 0x0ch-0x11h are the Alarm 0 registers. These are used to set up the Alarm 0, the interrupt pin and the Alarm 0 compare. • Addresses 0x12h-0x17h are the Alarm 1 registers. These are used to set up the Alarm 1, the interrupt pin and the Alarm 1 compare, Alarm 1 offers a enhanced resolution of tenth and hundredths of seconds. • Addresses 0x18h-0x1Fh are used for the power- down and power-up time-stamp feature. The detailed memory map is shown in Table 4-1. No error checking is provided when loading Time and Date registers. FIGURE 2-2: MEMORY MAP 0x00 0x07 Time and Date Configuration and Calibration Alarm 0 Alarm 1 Time-Stamp SRAM (64 Bytes) 0x09 0x0B 0x0C 0x11 0x12 0x17 0x18 0x1F 0x20 0x5F 0x00 EEPROM Memory 0x00 0x07 0x08 0x0F RTCC Register/SRAM EEPROM Unique ID Location 2 Unique ID Location 1 EUI-48/64 Unique ID 0xFF Note: 1K EEPROM Max address is 0x7F. |
Ähnliche Teilenummer - MCP795W21 |
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Ähnliche Beschreibung - MCP795W21 |
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