tmp86ch47ug TOSHIBA Semiconductor CORPORATION, tmp86ch47ug Datasheet - Page 62

• Manufacturer Part Number: tmp86ch47ug
• Description: 8 Bit Microcontroller Tlcs-870/c Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5.5 Port P4 (P47 to P40)
5.5 Port P4 (P47 to P40)
(0004H)
(000FH)
control. Input/output mode is specified by the corresponding bit in the port P4 input/output control register (P4CR).
Port P4 is configured as an input if its corresponding P4CR bit is cleared to “0”, and as an output if its corresponding
P4CR bit is set to “1”.
“0”.
regardless of P4CR contents, therefore initial output data should be written into the output latch before setting P4CR.
P4DR
P4CR
R/W
Port P4 is an 8-bit input/output port which can be configured as an input or an output in one-bit unit under software
During reset, the P4CR is initialized to “0” and port P4 is input mode. The P4 output latches are also initialized to
When used as an input port, the corresponding bit of P4CR is cleared to “0”.
When used as an output port, the corresponding bit of P4CR is set to “1”. Data can be written into the output latch
Note: Ports set to the input mode read the pin states. Ports set to the output mode read the output latch. When input pin
and output pin exist in port P4 together, the contents of the output latch which is specified as an input mode may be
rewritten by executing the bit manipulation instructions.
P47
P4CR
7
7
Data input (P4DR)
P46
P4CRi input
Data output
6
6
I/O control for port P4
(Specified for each bit)
OUTEN
P4CRi
STOP
P45
5
5
Output latch
P44
D
D
4
4
Figure 5-6 Port P4
Q
Q
P43
3
3
0: Input mode
1: Output mode
Page 52
P42
2
2
P41
1
1
P40
0
0
(Initial value: 0000 0000)
(Initial value: 0000 0000)
P4i
Note: i = 7
to
0
TMP86C845UG
R/W