AVR 135 (serv.man3) - Harman Kardon Audio Service Manual (repair manual). Page 72

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(Continued)

80

82

X0

A

Oscillator pin

81

83

X1

A

Oscillator pin

78

80

X0A

A

32 kHz oscillator pin

77

79

X1A

A

32 kHz oscillator pin

75

77

RST

B

Reset input pin

83 to 90 85 to 92

P00 to P07

C

 (CMOS) 

This is a general purpose I/O port. A setting in the pull-up 
resistance setting register (RDR0) can be used to apply pull-up 
resistance (RD00-RD07 

=

 “1”) . (Disabled when pin is set for 

output.)

AD00 to AD07

In multiplex mode, these pins function as the external address/
data bus low I/O pins.

D00 to D07

In non-multiplex mode, these pins function as the external data 
bus low output pins.

91 to 98

93 to 

100

P10 to P17

C

 (CMOS) 

This is a general purpose I/O port. A setting in the pull-up 
resistance setting resister (RDR1) can be used to apply pull-up 
resistance (RD10-RD17 

=

 “1”) . (Disabled when pin is set for 

output.)

AD08 to AD15

In multiplex mode, these pins function as the external address/
data bus high I/O pins.

D08 to D15

In non-multiplex mode, these pins function as the external data 
bus high output pins.

99,

100,

1,2

1 to 4

P20 to P23

E

 (CMOS/H) 

This is a general purpose I/O port. When the bits of external 
address output control register (HACR) are set to "1" in external 
bus mode, these pins function as general purpose I/O ports.

A16 to A19

When the bits of external address output control register (HACR) 
are set to "0" in multiplex mode, these pins function as address 
high output pins (A16-A19).

A16 to A19

When the bits of external address output control register (HACR) 
are set to "0" in non-multiplex mode, these pins function as 
address high output pins (A16-A19).

3 to 6

5 to 8

P24 to P27

E

 (CMOS/H) 

This is a general purpose I/O port. When the bits of external 
address output control register (HACR) are set to "1" in external 
bus mode, these pins function as general purpose I/O ports.

A20 to A23

When the bits of external address output control register (HACR) 
are set to "0" in multiplex mode, these pins function as address 
high output pins (A20-A23).

A20 to A23

When the bits of external address output control register (HACR) 
are set to "0" in non-multiplex mode, these pins function as 
address high output pins (A20-A23).

PPG0 to PPG3

PPG timer output pins.