TTP/C-C1 Communications Controller Data Sheet

AS8201

Rev. NC, October 1999

Page 4 of 13

Austria Mikro Systeme International AG

Pin Descriptio n

PinNr. Pin Name

Dir Description

1

VDD

P

positive power supply

2

VSS

P

negative power supply

3-18

RAM_DATA[0:15]

I/O DPRAM data bus, tristate

19

VDD

P

positive power supply

20

VSS

P

negative power supply

21

RAM_OEB

I

DPRAM output enable, active low

22

RAM_WEB

I

DPRAM write enable, active low

23

RAM_READYB

O

DPRAM ready, active low, indicates read/write operation finished

24

TIME_OVERFLOW

O

CNI control signal, overflow of global time

25

TIME_SIGNAL

O

CNI control signal, CNI time signal

26

TIME_TICK

O

CNI clock signal, macrotick, typically about 1us at 20 MHz clock.

27

MICROTICK

O

output of main clock, inverted to signal applied at pin XOUT0.

28

XENA0

I

oscillator 0 (main clock) enable, active low.

29

VDD

P

positive power supply

30

VSS

P

negative power supply

31

XIN0

A

analog pad from oscillator / use as input when providing external

clock

32

XOUT0

A

analog pad from oscillator / leave open when providing external

clock

33

VSS

P

positive power supply

34

VDD

P

negative power supply

35

OE[0]

I

channel [0]: transmitter output enable

36

RXD[0]

37

TXD[0]

O

channel [0]: transmit data

38

CTS[0]

O

channel [0]: transmitter clear to send

39

BDE[0]

O

channel [0]: bus driver enable

40

RESETB

I

(1) main reset input signal, active low. When connected the in-

ternal power-on reset function is overridden

(2) if unconnected: an internal reset is generated after power-on.

Reset pulse duration typically 24 us.

41

TEST_SE

42

FTEST

43

FTEST_IEN

44-50

LED[0:6]

O

test outputs:

(1) in production test used as scan chain outputs

(2) in operation: can be used as generic output port, e.g. to drive

LEDs

51

OE[1]

I

channel [1]: transmitter output enable

52

RXD[1]

53

TXD[1]

O

channel [1]: transmit data

54

CTS[1]

O

channel [1]: transmitter clear to send

55

BDE[1]

O

channel [1]: bus driver enable

56

XENA1

I

oscillator 1 (bus guardian) enable, active low.

57

VDD

P

positive power supply

58

VSS

P

negative power supply

59

XIN1

A

analog pad from oscillator / use as input when providing external

clock

60

XOUT1

A

analog pad from oscillator / leave open when providing external

clock

61

VSS

P

positive power supply

62

VDD

P

negative power supply