TMP86PM74AFG datasheet(67/190 Pages) TOSHIBA

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Page 57

TMP86PM74AFG

5.3

Port P2 (P22 to P20)

Port P2 is a 3-bit input/output port. It can work not only as a port but also as external input, STOP mode release

signal input, and low-frequency resonator connection pins. To use it as an input port or the secondary-function pins,

set the output latch (P2DR) to “1”. A reset initializes the P2DR to “1”. To run the device in dual clock mode, connect

a low-frequency resonator (32.768 kHz) to pins P21 (XTIN) and P22 (XTOUT). When the device runs in single

clock mode, P21 and P22 can be used as an ordinary input/output port. It is recommended that pin P20 be used for

external interrupt input, STOP release signal input, or as an input port (if it is used as an output port, it is set with the

content of the interrupt latch at the negative-going edge of the signal.)

Port P2 has separate data input registers. To sense the state of the output latch, read the P2DR. To sense the state of

the pins of the port, read the P2 port input data (P2PRD) register.

If a read instruction is executed for the P2DR or P2PRD on port P2, the sensed state of bits 7 to 3 is undefined.

Figure 5-4 Port P2

Note: Because pin P20 is used also as the STOP pin, its output high impedance becomes high when it enters the STOP mode

regardless of the state of OUTEN.

P2DR

(0002H)

R/W

543

P22

XTOUT

P21

XTIN

P20

INT5

STOP

(Initial value: **** *111)

P2PRD

(0016H)

Read only

543

P22

P21

P20

Output latch

Data input (P21)

Data output (P21)

Data output (P20)

Data input (P20)

Data input (P20PRD),

Data input (P22PRD)

Control input

Data input (P21PRD)

Data output (P22)

Data input (P22)

STOP

OUTEN

XTEN

P22 (XTOUT)

P21 (XTIN)

P20 (INT5, STOP)

Osc. enable

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