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VR4102 Datasheet(PDF) 204 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 204 Page - NEC

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CHAPTER 7 INITIALIZATION INTERFACE
204
7.1.5 HALTimer Shutdown
After an RTC reset is canceled, if the HAL timer is not canceled by software within about four seconds (the
HALTIMERRST bit of the PMUCNTREG register is not set to 1), the VR4102 enters reset status. Recovery from
reset status occurs when the POWER pin is asserted or when a WakeUpTimer interrupt occurs.
A reset by HAL timer initializes the entire internal state except for the RTC timer and the PMU.
After a reset, the processor becomes the system bus master and it begins the Cold reset exception sequence to
access the reset vectors in the ROM space. Since only part of the internal status is reset when a reset occurs in the
VR4102, the processor should be completely initialized by software.
Figure 7-5. HALTimer Shutdown
Reset#(internal)
ColdReset#(internal
MPOWER(o)
POWER(i)
MRAS(0:3)#/
UCAS#/LCAS#
(o)
RTC
(internal, 32kHz)
16MasterClock
Note
16ms
350ms
4s
Undefined
PLL(internal)
>32ms
Stable oscillation
POWERON(o)
Stopped
Stable oscillation
Note MasterClock is the basic clock used in the CPU core.



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