ST ST10F276E - Figure 41. Block Diagram of P4.5 Pin

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UM0404 Parallel ports
Figure 41. Block diagram of P4.5 pin
Note: When SALSEL = ‘10’, that is 8-bit segment address lines are selected, P4.5 is dedicated to
output the address: any attempt to use the CAN1 on P4.5 is masked.
When CAN parallel mode is selected, CAN2_RxD is remapped on P4.5: this occurs only if
CAN1 is enabled as well. On the contrary, if CAN1 is disabled, no remapping occurs.
P4.5
Direction
Latch
Write DP4.5
Read DP4.5
Port Output
Latch
Write P4.5
Read P4.5
MUX
1
0
Input
Latch
Clock
XPERCON.0
(CAN1EN)
CAN1_RxD
Data Input
I
n
t
e
r
n
a
l
B
u
s
MUX
1
0
Ext. Memory
Data Output
MUX
1
0
‘1’
Ext. Memory
Function
MUX
0
1
Enable
‘0’
MUX
1
0
CAN2_RxD
Data Input
XMISC.1
(CANPAR)
P4.4
&
&
XPERCON.1
(CAN2EN)
&
MUX
0
1
Open Drain
Latch
Write ODP4.5
Read ODP4.5
‘0’
Output
Buffer