TC1775 Datasheet, PDF (22/101 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1775
Preliminary
Table 1
Pin Definitions and Functions (cont’d)
Symbol Pin
HDRST⁴⁾ W20
PORST⁵⁾ Y21
In Functions
Out
I/O Hardware Reset Input/Reset Indication Output
Assertion of this bidirectional open-drain pin causes a
synchronous reset of the chip through external circuitry. This
pin must be driven for a minimum duration.
The internal reset circuitry drives this pin in response to a
power-on, hardware, watchdog and power-down wake-up
reset for a specific period of time. For a software reset,
activation of this pin is programmable.
I Power-on Reset Input
A low level on PORST causes an asynchronous reset of the
entire chip. PORST is a fully asynchronous level sensitive
signal.
CLKIN T1
I EBU Clock Input
CLKIN must be connected externally with CLKOUT. For fine-
tuning of the external bus interface timing, this external
connection can be an external delay circuit.
CLKOUT R1 O Clock Output
TEST
AB23 I
MODE⁴⁾
XTAL1
XTAL2
AC23 I
AC22 O
Test Mode Select Input
For normal operation of the TC1775, this pin should be
connected to V_DDP05.
Oscillator/PLL/Clock Generator Input/Output Pins
XTAL1 is the input to the main oscillator amplifier and input
to the internal clock generator. XTAL2 is the output of the
main oscillator amplifier circuit. For clocking the device from
an external source, XTAL1 is driven with the clock signal
while XTAL2 is left unconnected. For crystal oscillator
operation XTAL1 and XTAL2 are connected to the crystal
with the appropriate recommended oscillator circuitry.
XTAL3
XTAL4
AB21 I
AA20 O
Real Time Clock Oscillator Input/Output
XTAL3 and XTAL4 are the input and the output of the 32 kHz
oscillator that is used for the Real Time Clock.
Data Sheet
18
V1.2, 2002-05