PSB7280 Просмотр технического описания (PDF) - Siemens AG

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PSB7280

Joint Audio Decoder-Encoder

Siemens AG 

PSB 7280

Table 4

System Clocks

Pin No. Symbol Function Descriptions

90

XTAL1 I

91

XTAL2 O

Crystal In or Clock In.

If a crystal is used, it is connected between XTAL1 and

XTAL2. If a clock signal is provided (via an external

oscillator), this signal is input via XTAL1. In this case the

XTAL2 output is to be left non-connected. The XTAL1

input has to be 50% duty cycle and must not exceed the

voltage range between VSSA and VDDA.

Crystal Out.

Left unconnected if a crystal is not used.

86

CLKO O

Clock Out.

Output clock of frequency equal to the internal

frequency divided by a programmable factor.

Table 5

External Memory Interface (for Development Purposes only)

Pin No. Symbol Function Descriptions

75

CA0 O

C-Bus Address.

73

CA1 O

Used for addressing ROM or RAM external to the chip.

69

CA2 O

Is to be left NC if not used.

67

CA3 O

63

CA4 O

61

CA5 O

56

CA6 O

54

CA7 O

50

CA8 O

48

CA9 O

39

CA10 O

37

CA11 O

32

CA12 O

30

CA13 O

26

CA14 O

24

CA15 O

Semiconductor Group

13

Data Sheet 1998-07-01

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