Renesas SH7709S Manual Do Utilizador
Rev. 5.00, 09/03, page 596 of 760
19.6.2
Port E Data Register (PEDR)
Bit:
7
6
5
4
3
2
1
0
PE7DT
PE6DT
PE5DT
PE4DT
PE3DT
PE2DT
PE1DT
PE0DT
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 E data register (PEDR) is an 8-bit readable/writable register that stores data for pins
PTE7 to PTE0. Bits PE7DT to PE0DT correspond to pins PTE7 to PTE0. When the pin function is
general output port, if the port is read the value of the corresponding PEDR bit is returned directly.
When the function is general input port, if the port is read the corresponding pin level is read.
Table 19.10 shows the function of PEDR.
PTE7 to PTE0. Bits PE7DT to PE0DT correspond to pins PTE7 to PTE0. When the pin function is
general output port, if the port is read the value of the corresponding PEDR bit is returned directly.
When the function is general input port, if the port is read the corresponding pin level is read.
Table 19.10 shows the function of PEDR.
PEDR is initialized to H'00 by a power-on reset, after which the general input port function (pull-
up MOS on) is set as the initial pin function, and the corresponding pin levels are read. It retains
its previous value in standby mode and sleep mode, and in a manual reset.
up MOS on) is set as the initial pin function, and the corresponding pin levels are read. It retains
its previous value in standby mode and sleep mode, and in a manual reset.
Table 19.10 Port E Data Register (PEDR) Read/Write Operations
PEnMD1
PEnMD0
Pin State
Read
Write
0
0
Other function
(see table 18.1)
(see table 18.1)
PEDR value
Value is written to PEDR, but does not
affect pin state
affect pin state
1
Output
PEDR value
Write value is output from pin
1
0
Input (Pull-up
MOS on)
MOS on)
Pin state
Value is written to PEDR, but does not
affect pin state
affect pin state
1
Input (Pull-up
MOS off)
MOS off)
Pin state
Value is written to PEDR, but does not
affect pin state
affect pin state
(n = 0 to 7)