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AN2549 Scheda tecnica(PDF) 10 Page - STMicroelectronics

Il numero della parte AN2549
Spiegazioni elettronici  Porting an application from the ST10F269Zx to the ST10F272Z2
PDF  33 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2549 Scheda tecnica(HTML) 10 Page - STMicroelectronics

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AN2549
Modified features
10/33
Additional channels on Port1
A new multiplexer selects one out of up to 16 + 8 analog input channels (alternate functions
of Port 5 and Port1). The selection of Port1 or Port5 as the input of the ADC is made via bit
ADCMUX, bit 0 of the XMISC register. By default the multiplexer selects Port5, so there is no
impact on the software as compared to an ST10F269Zx implementation. Note that
XMISCEN, bit 10 of the XPERCON register, must be set to have access to the XMISC
register.
1.5
Real time clock
The RTC module can be clocked by two different sources: the main oscillator (pins XTAL1
and XTAL2) or the 32 kHz oscillator (pins XTAL3 and XTAL4). The selection of the clocking
can be made via an additional bit in the RTCCON register.
1.5.1
Hardware impact
Check the usage of pins XTAL3 and XTAL4 (pins 143 and 144, respectively).
1.5.2
Software impact
The address range of the RTC registers has been modified from 00’EC00h - 00’ECFFh on
the ST10F269Zx, to 00’ED00h - 00’EDFFh on the ST10F272Z2. This relocation has no
impact if the software uses register names defined by the toolchain and if the CPU selection
is changed to ST10F272Z2. If the software was directly using the address of the RTC
register, it must be modified according to the new mapping.
XMISC (EB46h)
XREG
Reset value: --00h
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
VREG
OFF
CAN
CK2
CAN
PAR
ADC
MUX
-
R/W
R/W
R/W
R/W
Table 8.
XMISC register description
Bit
Function
ADCMUX
ADC Multiplexer
0: Default configuration, analog inputs on port P5.y can be converted
1: Analog inputs on port P1.z can be converted, only 8 channels can be
managed
ST10F269Zx: RTCCON (F1C4h / E2h)
ESFR
Reset value: --00h
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
RTC
OFF
Reserved
RTC
AEN
RTC
AIR
RTC
SEN
RTC
SIR
-
R/W
-
R/W
R/W
R/W
R/W
ST10F272Z2: RTCCON (F1C4h / E2h)
ESFR
Reset value: 0000h
15
14
13
12
11
10
9
8
7654
3
2
1
0



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