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AN2556 Datasheet(PDF) 24 Page - STMicroelectronics

Part # AN2556
Description  Porting an application from the ST10F269Zx to the ST10F273Z4
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2556 Datasheet(HTML) 24 Page - STMicroelectronics

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Modified registers
AN2556
24/35
3
Modified registers
3.1
XPERCON register
In ST10F273Z4, new bits have been added with regard to the additional X-Peripherals.
The XPERCON register allows the X-Bus peripherals to be separately selected so they are
visible to the user by means of corresponding bits. If not selected (not activated with a bit of
XPERCON) before the XPEN bit in SYSCON is set, the corresponding address space, port
pins and interrupts are not occupied by the peripheral, and thus this peripheral is not visible
and not available.
ST10F269Zx: XPERCON (F024h/12h)
SFR
Reset value: --05h
15
14
13
12
11
10
9876
5
4321
0
Reserved
RTC
EN
XRAM
2EN
XRAM
1EN
CAN2
EN
CAN1
EN
-
RW
RW
RWRWRW
ST10F273Z4: XPERCON (F024h/12h)
SFR
Reset value: -005h
15
14
13
12
11
10
9876
5
4321
0
Reserved
XMIS
CEN
X12
CEN
XSSC
EN
XAS
CEN
XPW
MEN
XFLA
SHEN
RTC
EN
XRAM
2EN
XRAM
1EN
CAN2
EN
CAN1
EN
-
RWRW
RW
RWRWRW
RW
RW
RW
RW
RW
Table 15.
XPERCON register description
Bit
Bit name
Function
0CAN1EN
CAN1 Enable Bit
0: Accesses the CAN1 XPeripheral and its functions are disabled (P4.5 and
P4.6 pins can be used as general purpose I/Os).
1: The CAN1 XPeripheral is enabled and can be accessed.
1CAN2EN
CAN2 Enable Bit
0: Accesses the CAN2 XPeripheral and its functions are disabled (P4.4 and
P4.7 pins can be used as general purpose I/Os).
1: The CAN2 XPeripheral is enabled and can be accessed.
2XRAM1EN
XRAM1 Enable Bit
0: Access to the XRAM1 block is disabled, external access performed.
1: The on-chip XRAM1 is enabled and can be assessed
3XRAM2EN
XRAM2 Enable Bit
0: Access to the XRAM2 block is disabled, external access performed.
1: The on-chip XRAM2 is enabled and can be assessed.
4RTCEN
RTC Enable Bit
0: Access to the Real Time Clock is disabled, external access performed.
1: The Real Time Clock is enabled and can be accessed.



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