MB91360G Datasheet, PDF (133/189 Pages) Fujitsu Component Limited. – 32-bit RISC Microcontroller

MB91360G Series
27. REAL TIME CLOCK
This section provides an overview of the Real Time Clock (also called Watchtimer) , describes the register
structure and functions, and describes the operation of RTC module.The Real Time Clock (Watch Timer) consists
of the Timer Control register, Sub-second register, Second/Minute/Hour registers, 1/2 clock divider, 21bit
prescaler and Second/Minute/Hour counters. The Real Time Clock operates as the real-world timer and provides
the real-world time information.
(1) Block Diagram
Oscillation
clock
1/2 Clock
Divider
21 bit prescaler
CO
EN
Sub second
register
UPDT ST
Second counter
CI
EN
LOAD
CO
Minute counter
CO
Hour counter
CO
6 bits
6 bits
Second/Minute/Hour register
5 bits
INTE0 INT0
INTE1 INT1
INTE2 INT2
INT3 INT3
WOT
IRQ
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