S912XHY128F0VLM Datasheet, PDF (86/802 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Port Integration Module (S12XHYPIMV1)
2.3.3 Port A Data Register (PORTA)
Address 0x0000 (PRR)
7
6
5
4
3
2
R
PA7
PA6
PA5
PA4
PA3
PA2
W
—
—
—
—
API_EXTCLK
—
Altern.
Function
FP36
FP35
FP34
FP33
FP32
FP31
Reset
0
0
0
0
0
0
Figure 2-1. Port A Data Register (PORTA)
1 _{Read: Anytime. The data source is depending on the data direction value.}
Write: Anytime
Access: User read/write¹
1
0
PA1
PA0
XIRQ
FP30
0
IRQ
FP29
0
Field
7-4,2
PA
3
PA
1
PA
0
PA
Table 2-4. PORTA Register Field Descriptions
Description
Port A general purpose input/output data—Data Register, LCD segment driver output
The associated pin can be used as general purpose I/O when not used as alternative function is not enabled. In
general purpose output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1,
a read returns the value of the port register bit, otherwise the buffered pin input state is read.
• The LCD segment driver output takes precedence over the general purpose I/O function if the related LCD
segment is enabled.
Port A general purpose input/output data—Data Register, LCD segment driver output, API_EXTCLK
The associated pin can be used as general purpose I/O when not used as alternative function. In general purpose
output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1, a read returns
the value of the port register bit, otherwise the buffered pin input state is read.
• The LCD segment driver output takes precedence over the API_EXTCLK and general purpose I/O function if the
related LCD segment is enabled.
• The API_EXTCLK takes precedence over the general purpose I/O function if the API_EXTCLK function is enabled
Port A general purpose input/output data—Data Register, LCD segment driver output, XIRQ
The associated pin can be used as general purpose I/O when not used as alternative function. In general purpose
output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1, a read returns
the value of the port register bit, otherwise the buffered pin input state is read.
• The LCD segment driver output takes precedence over the XIRQ and general purpose I/O function if the related
LCD segment is enabled.
• The XIRQ takes precedence over the general purpose I/O function if the XIRQ function is enabled
Port A general purpose input/output data—Data Register, LCD segment driver output, IRQ
The associated pin can be used as general purpose I/O when not used as alternative function. In general purpose
output mode the register bit value is driven to the pin. If the associated data direction bit is set to 1, a read returns
the value of the port register bit, otherwise the buffered pin input state is read.
• The LCD segment driver output takes precedence over the IRQ and general purpose I/O function if the related
LCD segment is enabled.
• The IRQ takes precedence over the general purpose I/O function if the IRQ function is enabled
MC9S12XHY-Family Reference Manual, Rev. 1.01
86
Freescale Semiconductor