50
LQFP
QFP
Pin Name
Circuit Type
Function
P50
General-purpose I/O port
In the external bus mode, the pin functions as ALE pin.
68
70
ALE
D
(CMOS)
In the external bus mode, the pin functions as an address capture
enable signal (ALE) pin.
P51
General-purpose I/O port
In the external bus mode, the pin functions as the RDX pin.
69
71
RDX
D
(CMOS)
When the external bus mode is enabled, the pin functions as the read
strobe output (RDX) pin.
P52
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
70
72
WRLX
D
(CMOS)
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.
P53
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.
71
73
WRHX
D
(CMOS)
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.
P54
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.
72
74
HRQ
D
(CMOS)
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.
P55
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.
73
75
HAKX
D
(CMOS)
When the external bus mode is enabled, the pin functions as the hold
acknowledge output (HAKX) pin. When the HDE bit of the EPCR
register is 0, the pin functions as a general-purpose I/O port.
P56
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.
74
76
RDY
D
(CMOS)
When the external bus mode is enabled, the pin functions as the
external ready input (RDY) pin. When the RYE bit of the EPCR
register is 0, the pin functions as a general-purpose I/O port.
P57
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.
76
78
CLK
D
(CMOS)
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.
P60 to P63
General-purpose I/O port
36 to 39
38 to 41
AN0 to
AN3
H
(CMOS)
The pins function as analog input pins.
P64 to P67
General-purpose I/O port
41 to 44
43 to 46
AN4 to
AN7
H
(CMOS)
The pins function as analog input pins.
P70
General-purpose I/O port
25
27
SIN0
G
(CMOS/H)
The pin functions as an UART data input pin.
