tmp86c847iug TOSHIBA Semiconductor CORPORATION, tmp86c847iug Datasheet - Page 58

• Manufacturer Part Number: tmp86c847iug
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5.3 Port P2 (P22 to P20)
5. I/O Ports
5.3 Port P2 (P22 to P20)
Read only
(000AH)
(0002H)
P2PRD
nection pins. When used as an input port or a secondary function pins, respective output latch (P2DR) should be set
to “1”.
clock mode. In the single-clock mode, pins P21 and P22 can be used as normal input/output ports.
an input port. If it is used as an output port, the interrupt latch is set on the falling edge of the output pulse.
ister should be read. If a read instruction is executed for port P2, read data of bits 7 to 3 are unstable.
P2DR
R/W
Port P2 is a 3-bit input/output port.
It is also used as an external interrupt, a STOP mode release signal input, and low-frequency crystal oscillator con-
During reset, the P2DR is initialized to “1”.
A low-frequency crystal oscillator (32.768 kHz) is connected to pins P21 (XTIN) and P22 (XTOUT) in the dual-
It is recommended that pin P20 should be used as an external interrupt input, a STOP mode release signal input, or
P2 port output latch (P2DR) and P2 port terminal input (P2PRD) are located on their respective address.
When read the output latch data, the P2DR should be read and when read the terminal input data, the P2PRD reg-
Data input (P20PRD)
Data input (P21PRD)
Data input (P22PRD)
Data input (P20)
Data input (P21)
Data input (P22)
7
7
Control input
Data output
Data output
Data output
UTEN
ST P
XTEN
6
6
fs
5
5
utput latch
utput latch
utput latch
D
D
D
4
4
Q
Q
Q
Figure 5-4 Port P2
3
3
Page 50
XTOUT
P22
P22
2
2
XTIN
P21
P21
1
1
sc. enable
STOP
P20
INT5
P20
0
0
(Initial value: **** *111)
P20 (INT5, ST P)
P21 (XTIN)
P22 (XT UT)
TMP86C847IUG