SAK-C505CA-4RM CA Infineon Technologies, SAK-C505CA-4RM CA Datasheet - Page 51

• Manufacturer Part Number: SAK-C505CA-4RM CA
• Description: Microcontrollers (MCU) 8-Bit Single Chip Microcontroller
• Manufacturer: Infineon Technologies

Specifications of SAK-C505CA-4RM CA

• Data Bus Width: 8 bit
• Program Memory Type: ROM
• Program Memory Size: 32 KB
• Data Ram Size: 1.25 KB
• Interface Type: USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 3
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: PG-MQFP-44
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Packages: PG-MQFP-44
• Max Clock Frequency: 20.0 MHz
• Sram (incl. Cache): 1.25 KByte
• Can Nodes: 1
• A / D Input Lines (incl. Fadc): 8
• Program Memory: 32.0 KByte
• Lead Free Status / Rohs Status: No
• Other names: K505CA4RMCANT

Oscillator Watchdog
The oscillator watchdog unit serves for three functions:
Data Sheet
– Monitoring of the on-chip oscillator's function
– Fast internal reset after power-on
– Control of external wake-up from software power-down mode
The watchdog supervises the on-chip oscillator's frequency; if it is lower than the frequency
of the auxiliary RC oscillator in the watchdog unit, the internal clock is supplied by the RC
oscillator and the device is brought into reset; if the failure condition disappears (i.e. the on-
chip oscillator has a higher frequency than the RC oscillator), the part, in order to allow the
oscillator to stabilize, executes a final reset phase of typ. 1 ms; then the oscillator watchdog
reset is released and the part starts program execution from address 0000 H again.
The oscillator watchdog unit provides a clock supply for the reset before the on-chip oscillator
has started. The oscillator watchdog unit also works identically to the monitoring function.
When the power-down mode is left by a low level at the P3.2/INT0 pin or the P4.1/RXDC pin,
the oscillator watchdog unit assures that the microcontroller resumes operation (execution of
the power-down wake-up interrupt) with the nominal clock rate. In the power-down mode the
RC oscillator and the on-chip oscillator are stopped. Both oscillators are started again when
power-down mode is released. When the on-chip oscillator has a higher frequency than the
RC oscillator, the microcontroller starts program execution by processing a power down
interrupt after a final delay of typ. 1 ms in order to allow the on-chip oscillator to stabilize.
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