GDC21D601 Datasheet, PDF (90/189 Pages) Hynix Semiconductor – 32-Bit RISC MCU

GDC21D601
Section 11. Real Time Clock
1. General Description
This module is a 32-bit counter clocked by a 32.768KHz clock. This clock needs to be provided by the system,
since there is no oscillator inside the block. The clock is divided in the RTC core to provide a 1Hz clock 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 one event output which is synchronized with PCLK. RTCIRQ
is to be connected to the system interrupt controller.
from/to
APB
BnRES
PCLK
PSELRTC
PSTB
PWRITE
PA[4:2]
PD[31:0]
APB
INTERFACE
RTCIRQ
synchronized
event output
to
interrupt
controller
RTC
CORE
(COUNTER +
REGISTERS)
from
xtal
oscillator
CLK32K
Figure 1. Real Time Clock Connections Diagram
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