tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 45

• Manufacturer Part Number: tmp88cu74
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

P3
(00003H)
P3CR
(0002BH)
2.2.4
P3ODR0
P3ODR1
P3ODR2
Port P3 (P32 to P30)
Input/output mode is specified by the port P3 input/output control register (P3CR).
latches are initialized to “0”.
controlling by output data.
control register (P3CR).
data.
Note: Input mode port reads the state of input pin. When input/output mode is used to mixed,
P3CR
7
7
Port P3 is an 3-bit input/output port and serial interface (SIO1) input/output.
During reset P3CR is initialized to “0” and Port P3 is input mode. The port P3 output
P3 is serial bus interface input/output.
When used as function pins set to output mode by Port P3 I/O control register, and I/O is
The output buffer can be change to the tri-state or shink-open drain by Port P3 I/O
When a read instruction for port P3 is executed, bits 7 to 3 in P3 read is an undefined
the contents of output latch setting to the input mode may be overwritten by executing bit
manipulation instructions
6
6
I/O control of port P3
(Setting per bit)
P30 tri-state/open-drain control
P31 tri-state/open-drain control
P32 tri-state/open-drain control
P3O
DR2
Figure 2.2.5 P3 and Port P3 I/O Control Register
5
5
Output control
Input control
Data output
Data input
P3O
DR1
P3ODRi
4
4
P3CRi
P3O
DR0
3
3
Output latch
õ
D Q
88CU74-45
SCL
P32
SI0
2
2
0: Input mode
1: Output mode
0: Tri-state
1: Open-drain
P3CR
SDA
SO0
P31
1
1
SCK
P30
0
0
0
(Initial value: **** *000)
(Initial value: **00 0000)
Note 1: *: Don’t care
Note 2: i = 2 to 0
P3i
TMP88CU74
2007-10-19
2003-02-17
Write
only