GDC21D601 Datasheet, PDF (56/189 Pages) Hynix Semiconductor – 32-Bit RISC MCU

RUN -ARM720T Fast-bus Extension Mode.
The ARM720T works using only the BCLK. The
CPU operation clock and AMBA bus access clock
are the same. This mode can control the clock of
ASB and APB devices, so user can disable the clock
of devices or peripherals that are not using now. It is
possible to control the BCLK mask register or
PCLK mask register.
PDN – Power-Down Mode
When MCU system is in the PDN State, PMU block
GDC21D601
disables all of the blocks in the ASB and APB, so
the power consumption of system is dramatically low.
Although MCU is in the power down mode, user can
set some blocks are working in the power down
mode. It is possible control the BCLK or PCLK
mask register for power-down.
Wake-up from the PDN Mode.
The Wake-up is a temporal state for wake-up from
power down state through the interruption. After
wake-up state, next state becomes RUN state
automatically.
WD_OF nPOR
S/W Control
Man_reset
RESET
Wake-up
by nPOR
RUN
(use FCLK)
S/W Control
S/W ^Man_reset
Control
S/W
Control
Power Down
S/W
Control
RUN
(use B_CLK only)
Wake-up
by Interrupt
Figure 2. Reset and Power Management State Machine.
57