Harman Kardon AVR 3550 Service Manual page 34

LQFP QFP Pin Name
68 70
69 71
70 72
WRLX
71 73
WRHX
72 74
73 75
HAKX
74 76
76 78
P60 to P63
36 to 39 38 to 41 AN0 to
P64 to P67
41 to 44 43 to 46 AN4 to
25 27
Circuit Type
P50
D
(CMOS)
ALE
P51
D
(CMOS)
RDX
P52
D
(CMOS)
P53
D
(CMOS)
P54
D
(CMOS)
HRQ
P55
D
(CMOS)
P56
D
(CMOS)
RDY
P57
D
(CMOS)
CLK
H
(CMOS)
AN3
H
(CMOS)
AN7
P70
G
(CMOS/H)
SIN0
General-purpose I/O port
In the external bus mode, the pin functions as ALE pin.
In the external bus mode, the pin functions as an address capture
enable signal (ALE) pin.
General-purpose I/O port
In the external bus mode, the pin functions as the RDX pin.
When the external bus mode is enabled, the pin functions as the read
strobe output (RDX) pin.
General-purpose I/O port
When the external bus mode is enabled and the WRE bit of the EPCR
register is 1, the pin functions as the WRLX pin
When the external bus mode is enabled, the pin functions as the lower-
order side data write strobe output (WRLX) pin. When the WRE bit of
the EPCR register is 0, the pin functions as a general-purpose I/O port.
General-purpose I/O port
When the external bus mode is enabled (the bus is 16-bits long) and
the WRE bit of the EPCR register is 1, the pin functions as the WRHX
pin.
When the external bus mode is enabled (the bus is 16-bits long), the
pin functions as the higher-order side data write strobe output (WRHX)
pin. When the WRE bit of the EPCR register is 0, the pin functions as
a general-purpose I/O port.
General-purpose I/O port
When the external bus mode is enabled and the HDE bit of the EPCR
register is 1, the pin functions as the HRQ pin.
When the external bus mode is enabled, the pin functions as the hold
request input (HRQ) pin. When the HDE bit of the EPCR register is 0,
the pin functions as a general-purpose I/O port.
General-purpose I/O port
When the external bus mode is enabled and the HDE bit of the EPCR
register is 1, the pin functions as the HAKX pin.
When the external bus mode is enabled, the pin functions as the hold
acknowledge output (HAKX) pin.
register is 0, the pin functions as a general-purpose I/O port.
General-purpose I/O port When the external bus mode is enabled and
the RYE bit of the EPCR register is 1, the pin functions as the RDY pin.
When the external bus mode is enabled, the pin functions as the
external ready input (RDY) pin.
register is 0, the pin functions as a general-purpose I/O port.
General-purpose I/O port When the external bus mode is enabled and
the CKE bit of the EPCR register is 1, the pin functions as the CLK pin.
When the external bus mode is enabled, the pin functions as the
machine cycle clock output (CLK) pin. When the CKE bit of the EPCR
register is 0, the pin functions as a general-purpose I/O port.
General-purpose I/O port
The pins function as analog input pins.
General-purpose I/O port
The pins function as analog input pins.
General-purpose I/O port
The pin functions as an UART data input pin.
Function
When the HDE bit of the EPCR
When the RYE bit of the EPCR