ia82527 Innovasic Semiconductor Inc., ia82527 Datasheet - Page 21

• Manufacturer Part Number: ia82527
• Description: Serial Communications Controller?can Protocol
• Manufacturer: Innovasic Semiconductor Inc.

IA82527
CAN Serial Communications Controller
Table 3. Pin/Signal Descriptions (Continued)
p2.0
p2.1
p2.2
p2.3
p2.4
p2.5
p2.6
p2.7
rd_n
ready
Signal
wrh_n/p2.7
ready/miso
int_n/p2.6
rd_n/e
Name
p2.0
p2.1
p2.2
p2.3
p2.4
p2.5
Pin
PLCC
17
16
15
14
13
12
11
10
28
6
PQFP
11
10
44
22
9
8
7
6
5
4
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.
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 8-bit General Purpose Input Output (GPIO) ports
p2.6 and P2.7 are selectable and programmable, see
Section 4.1.3 I/O
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. 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.
IA211080504-02
Page 21 of 53
Ports.
Description
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March 12, 2009
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