SAF-C161U-LF V1.3 Infineon Technologies, SAF-C161U-LF V1.3 Datasheet - Page 210

• 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
Should the C161U require access to its external bus during hold mode, it activates its
bus request output BREQ to notify the arbitration circuitry. BREQ is activated only during
hold mode. It will be inactive during normal operation.
Figure 55
Note: C161U will complete the currently running bus cycle before granting bus access
Exiting the Hold State
The external bus master returns the access rights to the C161U by driving the HOLD
input high. After synchronizing this signal the C161U will drive the HLDA output high,
actively drive the control signals and resume executing external bus cycles if required.
Depending on the arbitration logic, the external bus can be returned to the C161U under
two circumstances:
• The external master does no more require access to the shared resources and gives
up its own access rights, or
HOLD
HLDA
BREQ
CSx
Other
Signals
as indicated by the broken lines. This may delay hold acknowledge compared to
this figure.
The figure above shows the first possibility for BREQ to get active.
During bus hold pin P3.12 is switched back to its standard function and is then
controlled by DP3.12 and P3.12. Keep DP3.12 = ’0’ in this case to ensure floating
in hold mode.
External Bus Arbitration, Releasing the Bus
210
External Bus Interface
MCD02238
2001-04-19
C161U