mc56f801 Freescale Semiconductor, Inc, mc56f801 Datasheet - Page 79

• Manufacturer Part Number: mc56f801
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

POR resets are extended 64 MSTR_OSC clocks to stabilize the power supply. All resets are subsequently
extended for an additional 32 MSTR_OSC clocks and 64 system clocks as the various internal reset
controls are released. Given the normal relaxation oscillator rate of 8MHz, the duration of a POR reset
from when power comes on to when code is running is 28μS. An external reset generation chip may also
be used. Resets may be asserted asynchronously, but they are always released internally on a rising edge
of the system clock.
Freescale Semiconductor
Preliminary
RESET IN
Power-On
External
(active
(active
(active
Reset
COP
low)
low)
Figure 6-15 Sources of RESET Functional Diagram (Test modes not included)
low)
RESET
POR
Delay blocks assert immediately and
deassert only after the programmed
number of clock cycles.
pulse shaper
MSTR_OSC
Delay 64
Clocks
SW Reset
COMBINED_RST
pulse shaper
MSTR_OSC
Delay 32
Clocks
56F8014 Technical Data, Rev. 9
EXTENDED_POR
pulse shaper
CLKGEN_RST
sys clocks
Delay 32
pulse shaper
sys clocks
Delay 32
OCCS
PERIP_RST
CORE_RST
Peripherals
Subsystem
Memory
JTAG
56800E
Resets
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