SAF-C161U-LF V1.3 Infineon Technologies, SAF-C161U-LF V1.3 Datasheet - Page 40

• 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

Data Sheet
Peripheral Timing
Internal operation of CPU and peripherals is based on the CPU clock (f
oscillator derives the CPU clock from the crystal or from the external clock signal. The
clock signal which is gated to the peripherals is independent from the clock signal which
feeds the CPU. During Idle mode the CPU’s clock is stopped while the peripherals
continue their operation. Peripheral SFRs may be accessed by the CPU once per state.
When an SFR is written to by software in the same state where it is also to be modified
by the peripheral, the software write operation has priority. Further details on peripheral
timing are included in the specific sections about each peripheral.
Programming Hints
Access to SFRs
All SFRs reside in data page 3 of the memory space. The following addressing
mechanisms allow to access the SFRs:
• Indirect or direct addressing with 16-bit (mem) addresses it must be guaranteed that
• Accesses via the Peripheral Event Controller (PEC) use the SRCPx and DSTPx
• Short 8-bit (reg) addresses to the standard SFR area do not use the data page
• Short 8-bit (reg) addresses to the extended ESFR area require switching to the 512
Byte write operations to word wide SFRs via indirect or direct 16-bit (mem) addressing
or byte transfers via the PEC force zeros in the non-addressed byte. Byte write
operations via short 8-bit (reg) addressing can only access the low byte of an SFR and
force zeros in the high byte. It is therefore recommended, to use the bit field instructions
(BFLDL and BFLDH) to write to any number of bits in either byte of an SFR without
disturbing the non-addressed byte and the unselected bits.
Reserved Bits
Some of the bits which are contained in the C161U's SFRs are marked as 'Reserved'.
User software should never write '1's to reserved bits. These bits are currently not
implemented and may be used in future products to invoke new functions. In this case,
the active state for these functions will be '1', and the inactive state will be '0'. Therefore
writing only ‘0’s to reserved locations provides portability of the current software to future
devices. Read accesses to reserved bits return ‘0’s.
the used data page pointer (DPP0...DPP3) selects data page 3.
pointers instead of the data page pointers.
pointers but directly access the registers within this 512 Byte area.
Byte extended SFR area. This is done via the EXTension instructions EXTR,
EXTP(R), EXTS(R).
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Architectural Overview
CPU
). The on-chip
2001-04-19
C161U