
592
19.2.2
Port A Data Register (PADR)
Bit:
7
6
5
4
3
2
1
0
PA7DT
PA6DT
PA5DT
PA4DT
PA3DT
PA2DT
PA1DT
PA0DT
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The port A data register (PADR) is an 8-bit readable/writable register that stores data for pins
PTA7 to PTA0. Bits PA7DT to PA0DT correspond to pins PTA7 to PTA0. When the pin function
is general output port, if the port is read the value of the corresponding PADR bit is returned
directly. When the function is general input port, if the port is read the corresponding pin level is
read. Table 19.2 shows the function of PADR.
PADR is initialized to H'00 by a power-on reset. It retains its previous value in standby mode and
sleep mode, and in a manual reset.
Table 19.2
Port A Data Register (PADR) Read/Write Operations
PAnMD1 PAnMD0 Pin State
Read
Write
0
0
Other function
(See table 18.1)
PADR value
Value is written to PADR, but does not affect
pin state.
1
Output
PADR value
Write value is output from pin.
1
0
Input (Pull-up
MOS on)
Pin state
Value is written to PADR, but does not affect
pin state.
1
Input (Pull-up
MOS off)
Pin state
Value is written to PADR, but does not affect
pin state.
(n = 7 to 0)
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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