Maxim Integrated Secure Microcontroller - Manual (Page 163)

Secure Microcontroller User’s Guide
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Figure 17-6. DS2251T/DS2252T RTC Block Diagram
17.6 Memory Map
The RTCs in the DS2251T and DS2252T are memory mapped. It is accessed using the peripheral selects.
First, the PES bit at MCON.2 must be set to a logic 1. This enables the peripheral space in the MOVX
area. The RTC function is mapped under
PE1 . This area begins at address 0000h. The timekeeping map
consists of 14 time-related registers and 50 bytes of SRAM. It is illustrated in Figure 17-7 .