SAK-C504 Infineon Technologies AG, SAK-C504 Datasheet - Page 11

• Manufacturer Part Number: SAK-C504
• Description: 8-Bit Single-Chip Microcontroller
• Manufacturer: Infineon Technologies AG

Data Sheet
Table 1
Symbol
CTRAP
XTAL2
XTAL1
P2.0 - P2.7 18-25
Pin Number
(P-MQFP-44)
6
14
15
Pin Definitions and Functions (cont’d)
I/O
I/O
I
–
–
1)
Function
CCU Trap Input
With CTRAP = low, the compare outputs of the
CAPCOM unit are switched to the logic level as
defined in the COINI register (if they are enabled by
the bits in SFR TRCON). CTRAP is an input pin with
an internal pullup resistor. For power saving
reasons, the signal source which drives the CTRAP
input should be at high or floating level during
power-down mode.
XTAL2
Output of the inverting oscillator amplifier.
XTAL1
Input to the inverting oscillator amplifier and input to
the internal clock generator circuits.
To drive the device from an external clock source,
XTAL1 should be driven, while XTAL2 is left
unconnected. There are no requirements on the
duty cycle of the external clock signal, since the
input to the internal clocking circuitry is divided down
by a divide-by-two flip-flop. Minimum and maximum
high and low times as well as rise/fall times specified
in the AC characteristics must be observed.
Port 2
is a bidirectional I/O port with internal pullup
resistors. Port 2 pins that have “1”s written to them
are pulled high by the internal pullup resistors, and
in that state can be used as inputs. As inputs, Port 2
pins being externally pulled low will source current
(
internal pullup resistors. Port 2 emits the high-order
address byte during fetches from external program
memory and during accesses to external data
memory that use 16-bit addresses (MOVX @DPTR).
In this application it uses strong internal pullup
resistors when issuing “1”s. During accesses to
external data memory that use 8-bit addresses
(MOVX @Ri), Port 2 issues the contents of the P2
special function register.
I
IL
, in the DC characteristics) because of the
7
2000-05
C504