IA82527 Datasheet, PDF (17/45 Pages) InnovASIC, Inc – Serial Communications Controller CAN Protocol

IA82527
CAN Serial Communications Controller
As of Production Ver. 00
04 May 2007
PRELIMINARY
Table 3. IA82527 Pin/Signal Descriptions, continued
Signal
wr_n
wrh_n
wrl_n
xtal1
xtal2
Pin
Name
PLCC
wr_n/wrl_n/r-w_n
7
wrh_n/p2.7
10
wr_n/wrl_n/r-w_n
7
—
18
—
19
Description
QFP
write. Input. Active Low. Mode 0.
1
When wr_n is asserted (low), it signals a write cycle.
write high byte. Input. Active Low. Mode 1.
4 When wrh_n is asserted (low), it signals a write cycle for the high
byte of data (bits 15–8).
write low byte. Input. Active Low. Mode 1.
1 When wrl_n is asserted (low), it signals a write cycle for the low byte
of data (bits 7–0).
Crystal (xtal) 1. Input.
The xtal1 pin is the input connection for an external crystal that
drives the IA82527 internal oscillator. (When an external crystal is
used, it is connected between this pin and the xtal2 pin—see next
12 table entry.)
NOTE: If an external oscillator or clock source is used to drive the
IA82527 instead of a crystal, the xtal1 pin is the input for this clock
source.
Crystal (xtal) 2. Output (push-pull).
The xtal2 pin is the output connection for an external crystal that
drives the IA82527 internal oscillator. (When an external crystal is
used, it is connected between this pin and the xtal1 pin—see
13 ^{previous table entry.)}
NOTE: If an external oscillator or clock source is used to drive the
IA82527 instead of a crystal, xtal2 must be left unconnected (i.e.,
must be floated). Additionally, the xtal2 output must not be used as a
clock source for other system components.
Copyright  2007
©
EN21070504-00
Page 17 of 45
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