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C161K

16-Bit Single-Chip Microcontroller

Infineon Technologies 

C161K

C161O

Table 2

Pin Definitions and Functions (cont’d)

Symbol Pin Input Function

Num Outp.

RSTIN 65

I/O Reset Input with Schmitt-Trigger characteristics. A low level

at this pin while the oscillator is running resets the C161K/O.

An internal pullup resistor permits power-on reset using only

a capacitor connected to VSS. A spike filter suppresses input

pulses < 10 ns. Input pulses >100 ns safely pass the filter.

The minimum duration for a safe recognition should be

100 ns + 2 CPU clock cycles.

In bidirectional reset mode (enabled by setting bit BDRSTEN

in register SYSCON) the RSTIN line is internally pulled low

for the duration of the internal reset sequence upon any reset

(HW, SW, WDT). See note below this table.

Note: To let the reset configuration of PORT0 settle a reset

duration of ca. 1 ms is recommended.

RST 66

O

OUT

Internal Reset Indication Output. This pin is set to a low level

when the part is executing either a hardware-, a software- or

a watchdog timer reset. RSTOUT remains low until the EINIT

(end of initialization) instruction is executed.

NMI 67

I

Non-Maskable Interrupt Input. A high to low transition at this

pin causes the CPU to vector to the NMI trap routine. When

the PWRDN (power down) instruction is executed, the NMI

pin must be low in order to force the C161K/O to go into

power down mode. If NMI is high, when PWRDN is

executed, the part will continue to run in normal mode.

If not used, pin NMI should be pulled high externally.

P6

IO

Port 6 is a 4-bit bidirectional I/O port. It is bit-wise

programmable for input or output via direction bits. For a pin

configured as input, the output driver is put into high-

impedance state. Port 6 outputs can be configured as push/

pull or open drain drivers.

The Port 6 pins also serve for alternate functions:

P6.0 68

O

CS0

Chip Select 0 Output

P6.1 69

O

CS1

Chip Select 1 Output

P6.2 70

O

CS2

P6.3 71

O

CS3

Chip Select 2 Output

Chip Select 3 Output

These chip select outputs are only available in the C161O.

Data Sheet

7

V2.0, 2001-01

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