SAF-C161U-LF V1.3 Infineon Technologies, SAF-C161U-LF V1.3 Datasheet - Page 293

• 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

13
13.1
Real Time Clock (RTC) module of the C161U basically is an independent timer chain
and counts time ticks. The base frequency of the RTC can be programmed via a reload
counter. The RTC can work fully asynchronous to the system frequency and is optimized
on low power consumption.
13.1.1
The RTC serves for different purposes:
– System clock to determine the current time and date
– Cyclic time based interrupt
– Alarm interrupt for wake up on a defined time
– 48-bit timer for long term measurements
13.1.2
The real time clock module provides three different types of registers: two control
registers for controlling the RTC´s functionality, three data registers for setting the clock
divider for RTC base frequency programming and for flexible interrupt generation, and
three counter registers they contain the actual time and date. The interrupts are
programmed via one interrupt sub node register.
13.2
RTC module consists of a chain of 2 divider blocks, the reloadable 16-bit timer T14 and
the 32-bit RTC timer (accessible via registers RTCH and RTCL). Both timers count up.
Timer T14 is reloaded with the value of register T14REL on every timer T14 overflow.
The count input of the RTC module (RTC_REF_CLK) can be optional divided by a
prescaler with factor 8, see Figure 93.
The RTC module operates in two different modes, an asynchronous and a synchronous
mode. In synchronous mode the RTC module is clocked with a synchronous clock
referring to the CPU clock (RTC clock). In asynchronous mode the RTC module is
clocked with the asynchronous counting input clock (RTC_REF_CLK). The
asynchronous mode is necessary in case of a very low or disabled CPU clock (eg. sleep
mode).
The mode control (asynchronous / synchronous) of the RTC is described as follows:
• The RTC is switched to asynchronous mode if SYSCON2.RCS = '1'
• The RTC is switched to asynchronous mode if device is in sleep mode.
Data Sheet
Introduction
Features
Function Description
Real Time Clock (RTC)
Overview
293
Real Time Clock (RTC)
2001-04-19
C161U