IA82527
Data Sheet
CAN Serial Communications Controller
December 20, 2012
Table 3. Pin/Signal Descriptions (Continued)
Pin
Signal
p2.0
Name
p2.0
p2.1
p2.2
p2.3
p2.4
p2.5
PLCC PQFP
Description
17
16
15
14
13
12
11
10
11
10
9
port 2, bit N (N = 7–0). Input/Output. Port 2 bits p2.7–
p2.0, can be individually programmed as inputs or
outputs. Programming is accomplished by writing to
the P2CONF Register (AFH). The 8 bits of the
P2CONF Register, P2CONF7–P2CONF0, correspond
directly to pins p2.7–p2.0. Writing a 0 to a bit in the
P2CONF Register causes the corresponding pin to be
configured as a high-impedance input. Writing a 1 to a
bit in the P2CONF Register causes the corresponding
pin to be configured as a push-pull output. All Port 2
pins have weak pull-ups until the port is configured by
writing to the P2CONF Register. The default value of
the P1CONF Register following a reset is 00H.
p2.1
p2.2
p2.3
p2.4
p2.5
p2.6
p2.7
8
7
6
int_n/p2.6
5
wrh_n/p2.7
4
Data is read from Port 2 via the P2IN Register (CFH).
A logic 0 for any bit in this register means that a logic 0
was read from the corresponding pin; a logic 1 for any
bit means that a logic 1 was read from the
corresponding pin. The default value of the P2IN
Register following a reset is FFH.
Data is written to Port 2 via the P2OUT Register
(EFH). Writing a logic 0 to any bit in this register
means that a logic 0 is written to the corresponding
pin; writing a logic 1 to any bit means that a logic 1 is
written to the corresponding pin. The default value of
the P2OUT Register following a reset is 00H.
Two bits of Port 2 (P2.7 and P2.6) have alternate
functions based on CPU interface mode.
See Section 4.1.3 I/O Ports.
rd_n
rd_n/e
6
44
22
read. Input. Active Low. Mode 0 and Mode 1. When
rd_n is asserted (low), it causes the IA82527 to drive
the data from the location being read onto the data
bus.
ready
ready/miso
28
ready. Output (open drain). Active High. Mode 0 and
Mode 1. When ready is asserted (high), it signals the
completion of a bus cycle. The ready output is
provided to force system CPU wait states as required.
IA211080504-07
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