saa-xc866 Infineon Technologies Corporation, saa-xc866 Datasheet - Page 57

• Manufacturer Part Number: saa-xc866
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

3.7
The SAA-XC866 has five types of reset: power-on reset, hardware reset, watchdog timer
reset, power-down wake-up reset, and brownout reset.
When the SAA-XC866 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 V
capacitor at RESET pin. This capacitor value must be selected so that V
0.4 V, but not before V
A typical application example is shown in
V
Typically, the time taken for V
reaches 2.3V. Hence, based on the condition that 10% to 90% V
than 500 µs, the RESET pin should be held low for 500 µs typically. See
Figure 21
Data Sheet
DDC
capacitor value is 220 nF. The capacitor connected to RESET pin is 100 nF.
DDC
reaches 0.9*V
Reset Control
100nF
typ.
Reset Circuitry
DDC
DDC
reaches 0.9* V
. The delay of external reset can be realized by an external
DDC
RESET
VSSP
e.g. 300nF
30k
to reach 0.9*V
5V
DDC.
53
VDDP
Figure
21. V
DDC
VDDC
EVR
is less than 50 µs once V
DDP
220nF
capacitor value is 300 nF.
Functional Description
VSSC
DDP
XC866
(slew rate) is less
Table
RESET
Figure
SAA-XC866
V1.2, 2008-02
19) must
reaches
22.
DDP