1.6 Pin Description
14
Chapter 1: Overview
54
P52/HAKX
E
P52 is a general-purpose I/O port. This signal is enabled when
the hold function is disabled.
HAKX is the hold acknowledge signal output pin. This func-
tion is enabled when the hold function is enabled.
55
P53/HRQ
E
P53 is a general-purpose I/O port. This signal is enabled when
the hold function is disabled.
HRQ is the hold request signal input pin. This function is
enabled when the hold function is enabled.
56
P54/WRHX
F
P54 is a general-purpose I/O port. This function is enabled
when operating in 8-bit external bus mode or when WR pin
output is disabled.
WRHX is the write strobe signal output pin for the high 8-bit
portion of the data bus. This function is enabled when operat-
ing in 16-bit external bus mode, or when WR pin output is
enabled.
57
P55/WRLX
F
P55 is a general-purpose I/O port. This function is enabled
when the WR pin 'output' setting is disabled.
WRLX is the write strobe signal output pin for the low 8-bit
portion of the data bus. This function is enabled when WR pin
output is enabled.
58
P56/RDX
F
P56 is not available for use as a general-purpose port.
RDX is the read strobe output signal for the data bus.
59
P57/ASR3/INT3
F
P57 is a general-purpose I/O port.
ASR3 is the data input pin for input capture #3. This function
is used for input at all times when input capture #3 is enabled
for input, and therefore I/O access from other functions should
not be attempted unless intended.
INT3 is the data input pin for external interrupt #3. This func-
tion is used for input at all times when external interrupt #3 is
enabled for input, and therefore I/O access from other func-
tions should not be attempted unless intended.
60
RSTX
B
External reset request input.
61
VSS
Power supply
Digital circuit ground level pin.
62
63
X0
X1
A
Crystal oscillator signal pins (32 MHz).
64
VCC
Power supply
Digital circuit power supply.
65 to
72
P00/D00 to
P07/D07
E
P00 to P07 are not available for use as general-purpose ports.
D00 to D07 are I/O pins for the lower 8 bits of the external
data bus.
73 to
80
P10/D08 to
P07/D15
E
P10 to P17 are general-purpose I/O ports. This function is
enabled when in 8-bit external bus mode.
D08 to D15 are I/O pins for the upper 8 bits of the external
data bus. This function is enabled when in 16-bit external bus
mode.
Table 1.6 Pin Description (Continued)
Pin No.
Name
Circuit type
Function