SAF-C161U-LF V1.3 Infineon Technologies, SAF-C161U-LF V1.3 Datasheet - Page 361

• Manufacturer Part Number: SAF-C161U-LF V1.3
• Description: IC MCU ISDN 16BIT TTL TQFP-100
• Manufacturer: Infineon Technologies
• Series: C16xxr

Specifications of SAF-C161U-LF V1.3

• Core Processor: C166
• Core Size: 16-Bit
• Speed: 36MHz
• Connectivity: EBI/EMI, SPI, UART/USART, USB
• Peripherals: POR, PWM, WDT
• Number Of I /o: 56
• Program Memory Type: ROMless
• Ram Size: 3K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Other names: SAFC161ULFV1.3X; SAFC161ULFV13XP; SP000007502

Figure 114
Hardware Reset
A hardware reset is triggered when the reset input signal RSTIN is latched low. To
ensure the recognition of the RSTIN signal (latching), it must be held low for at least
8 CPU clock cycles.
Note: During reset, the CPU is clocked with the free-running PLL clock which may run
Also shorter RSTIN pulses may trigger a hardware reset, if they coincide with the latch’s
sample point. However, it is recommended to keep RSTIN low for ca. 1 ms. After the
reset sequence has been completed, the RSTIN input is sampled. When the reset input
signal is active at that time the internal reset condition is prolonged until RSTIN gets
inactive.
During a hardware reset the PORT0 inputs for the reset configuration need some time
to settle on the required levels, especially if the hardware reset aborts a read operation
form an external peripheral. During this settling time the configuration may intermittently
be wrong. In such a case also the PLL clock selection may be wrong.
Note: To ensure a glitch free start-up of the C161U, it is strongly recommended to
Data Sheet
as slow as < 1 MHz.
provide an external reset pulse of ca. 1 ms in order to allow the PLL to settle on
the desired CPU clock frequency.
Reset
External Reset Circuitry
C161U
V
CC
RSTOUT
+
361
b)
RSTIN
a) Generated Warm Reset
b) Automatic Power-ON Reset
a)
&
Hardware
External
External
Reset
Sources
MCA02259
System Reset
2001-04-19
C161U