GMS30C7201 Datasheet, PDF (292/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Slow AMBA Peripherals
13.10 Real Time Clock
13.10.1Module Overview
This module is a 32-bit counter clocked by a 32768Hz clock. This clock needs to be provided
by the system, as there is no oscillator inside the block. The clock is divided in the RTC core to
provide a 1Hz clock which is used to drive a 32-bit counter which forms the Real Time Clock
(RTC). It also contains a 32-bit match register which can be programmed to generate an
interrupt signal when the time in the RTC matches the specific value written to this register
(alarm function - RTC event). The RTC has two event outputs, one which is synchronized to
PCLK, SRTCEV, and the second, URTCEV synchronized to the 32768Hz clock. SRTCEV is to
be connected to the system interrupt controller, and URTCEV is used in the PMU to provide a
system alarm wakeup.
nPOR
from/to
APB
PCLK
PSEL
PSTB
PWRITE
PA[4:2]
PD[31:0]
APB
INTERFACE
RTC
CORE
(COUNTER +
REGISTERS)
SRTCEV
synchronized
event output
to
interrupt
controller
URTCEV _{unsynchronized}
interrupt
from
xtal
oscillator
CLK32768Hz
Figure 13-10: Real Time Clock connections diagram
13-64
GMS30C7201 Data Sheet