6-8
MSM66591/ML66592 User's Manual
Chapter 6 Port Functions
6.2
Port Control Registers
The MSM66591/ML66592 have 3 types of port control registers.
• port data register (Pn: n = 0–12)
• port mode register (PnIO: n = 0–12)
• port secondary function control register (PnSF: n = 2–10)
These registers are allocated as SFRs. Table 6-2 lists the port control registers.
6.2.1 Port Data Register (Pn: n = 0–12)
A port data register (Pn: n = 0–12) is an 8-bit register that stores the output data of a
port. Port 12, however, is a 2-bit register.
Pn is assigned to SFR, and the content of P0–P12 becomes 00H at reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog timer (WDT) is
overflown, or an operation code trap is generated).
If a read instruction is executed to Pn, the pin status ("0" or "1") is read from the port
specified to input, and the Pn status ("0" or "1") is read from the port specified to output.
If a write instruction is executed to Pn, data is written to Pn, regardless of the I/O
specification of the port.
Each of the bits assigned in a port is represented by the bit symbol corresponding to
each bit. Bit symbols for bits of a port data register are, for example, P0_0 for bit 0 and
P0_1 for bit 1 in Port 0. So, a port data register is represented correspending to each bit
either by the bit symbol such as P0_0 or P0_1 or by the dot operator such as P0.0 or
P0.1 in assembly language.
6.2.2 Port Mode Register (PnIO: n = 0–12)
A port mode register (PnIO: n = 0–12) is an 8-bit register that specifies the input/output
of an I/O port. Port 12, however, is a 2-bit register.
PnIO is assigned to SFR, and the content of P0IO–P12IO becomes 00H. All ports
become input mode at reset (when the
RES
signal is input, the BRK instruction is
executed, the watchdog timer is overflown, or an operation code trap is generated).
If each bit of PnIO is set to "0", the input mode is set. If set to "1", the output mode is
set. However, as explained below, if the secondary function is selected after setting the
content of the port secondary function control register (PnSF: n = 2–10) to "1", specifi-
cation by PnIO becomes invalid.
6.2.3 Port Secondary Function Control Register (PnSF: n = 2–10)
A port secondary function control register (PnSF: n = 2–10) is an 8-bit register that
specifies the primary/secondary functions of a port. Port 7 is a 6-bit register.
Содержание MSM66591
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Страница 18: ...Overview Chapter 1 1...
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Страница 30: ...Description of Pins Chapter 2 2...
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Страница 118: ...Port Functions Chapter 6 6...
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