SAF-C161U-LF V1.3 Infineon Technologies, SAF-C161U-LF V1.3 Datasheet - Page 80

• 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
SP (FE12
Stack Overflow Pointer STKOV
This non-bit addressable register is compared against the SP register after each
operation, which pushes data onto the system stack (eg. PUSH and CALL instructions
or interrupts) and after each subtraction from the SP register. If the content of the SP
register is less than the content of the STKOV register, a stack overflow hardware trap
will occur.
Since the least significant bit of register STKOV is tied to '0' and bits 15 through 12 are
tied to '1' by hardware, the STKOV register can only contain values from F000
FFFE
STKOV (FE14
The Stack Overflow Trap (entered when (SP) < (STKOV)) may be used in two different
ways:
• Fatal error indication treats the stack overflow as a system error through the
• Automatic system stack flushing allows to use the system stack as a 'Stack Cache'
Bit
sp
Bit
stkov
15
15
1
1
r
r
associated trap service routine. Under these circumstances data in the bottom of the
stack may have been overwritten by the status information stacked upon servicing the
stack overflow trap.
for a bigger external user stack. In this case register STKOV should be initialized to a
value, which represents the desired lowest Top of Stack address plus 12 according to
the selected maximum stack size. This considers the worst case that will occur, when
a stack overflow condition is detected just during entry into an interrupt service routine.
H
.
14
14
1
1
r
r
H
/ 09
13
13
1
1
H
r
r
H
/ 0A
)
Function
Modifiable portion of register SP
Specifies the top of the internal system stack.
Function
Modifiable portion of register STKOV
Specifies the lower limit of the internal system stack.
12
12
H
1
1
r
r
)
11
11
10
10
9
9
8
8
SFR
SFR
80
7
7
stkov
sp
rw
rw
6
6
5
5
4
4
Central Processor Unit
Reset Value: FC00
3
Reset Value: FA00
3
2
2
2001-04-19
1
1
C161U
0
0
0
0
r
r
H
H
H
to