863
Reset
Chapter 26
Preliminary User’s Manual U17566EE1V2UM00
(2)
Hardware status
With each reset function the hardware is initialized (including the watchdog).
When the reset status is released, program execution is started.
The following table describes the status of the clocks during reset and after
reset release. Note that the clock status "operates" does not inevitably mean
that any function using this clock source operates as well. The function may
additionally require to be enabled by other means.
Table 26-1
Hardware status during and after reset
Item
During reset
After reset
Main oscillator
Stops oscillation
Stopped
a
a)
The main oscillator is started by the internal firmware. However the application software has to ensure stable
main oscillation before utilizing this clock for any purpose. SSCG and PLL must be started by the application
software. Assure also here that the stabilization time has passed. See chapter
“Clock Generator“ on page 129
for details.
Sub oscillator
Operates
Starts oscillation
Ring oscillator
Operates
Starts oscillation
The ring oscillator clock is the default clock source
after reset release.
SSCG clock
Stops operation
Stopped
a
PLL clock
Stops operation
Stopped
a
CPU system clock (VBCLK)
Stops operation
Starts oscillation based on the ring oscillator clock.
CPU
Initialized
Program execution starts after oscillation stabilization
time.
Watchdog Timer (WDTCLK)
Stops operation
Starts operation based on ring oscillator clock
Watch Timer (WTCLK)
Stops operation
Starts operation based on ring oscillator clock
Peripheral clocks
Stop operation
•
PCLK0–2: operating based on ring-osc
•
PCLK3-15: stopped
•
SPCLK0–2: operating based on ring-osc
•
SPCLK3-15: stopped
On-chip peripheral functions
Stop operation
Depends on availability of peripheral clock and default
status of the peripheral function.
I/O pins
(port/alternative function pins)
All pins are in input port mode
b
. See chapter
“Pin Functions“ on page 33
for a
description.
b)
The status of the N-Wire debug interface pins DRST (P05), DDI (P52), DDO (P53), DCK (P54), DMS (P55)
after reset depends on the reset value of the OCDM register, and therefore on the reset source. See chapter
“Pin Functions“ on page 33
for details.
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