saf-xc888cm-8ffi5v Infineon Technologies Corporation, saf-xc888cm-8ffi5v Datasheet - Page 76

• Manufacturer Part Number: saf-xc888cm-8ffi5v
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

3.7
The XC886/888 has five types of reset: power-on reset, hardware reset, watchdog timer
reset, power-down wake-up reset, and brownout reset.
When the XC886/888 is first powered up, the status of certain pins (see
be defined to ensure proper start operation of the device. At the end of a reset sequence,
the sampled values are latched to select the desired boot option, which cannot be
modified until the next power-on reset or hardware reset. This guarantees stable
conditions during the normal operation of the device.
In order to power up the system properly, the external reset pin RESET must be asserted
until
capacitor at RESET pin. This capacitor value must be selected so that
0.4 V, but not before
A typical application example is shown in
while the
100 nF.
Typically, the time taken for
2.3V. Hence, based on the condition that 10% to 90%
500 µs, the RESET pin should be held low for 500 µs typically. See
Figure 22
Data Sheet
V
DDC
V
reaches 0.9*
Reset Control
DDC
V
Reset Circuitry
IN
capacitor value is 220 nF. The capacitor connected to RESET pin is
100nF
typ.
V
DDC
V
VR
DDC
reaches 0.9*
V
. The delay of external reset can be realized by an external
DDC
to reach 0.9*
RESET
3.3 / 5V
V
SSP
30k
100nF
V
Figure
DDC.
69
V
V
DDP
DDC
22. The
is less than 50 µs once
V
DDC
EVR
V
V
DDP
220nF
DDP
capacitor value is 100 nF
Functional Description
XC886/888
(slew rate) is less than
V
SSC
Figure
XC886/888CLM
V
Table
RESET
V
V1.1, 2009-01
DDP
23.
23) must
reaches
reaches