TMP88CS38FG datasheet(45/226 Pages) TOSHIBA

45 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-45

When reading an I/O port except programmable I/O ports, whether the pin input data or the

output latch contents are read depends on the instructions, as shown below:

(1) Instructions that read the output latch contents

1. XCH r, (src)

2. SET/CLR/CPL (src).b

3. SET/CLR/CPL (pp).g

4. LD (src).b, CF

5. LD (pp).b, CF

6. ADD/ADDC/SUB/SUBB/AND/OR/XOR (src), n

7. (src) side of ADD/ADDC/SUB/SUBB/AND/OR/XOR (src), (HL)

(2) Instructions that read the pin input data

1. Instructions other than the above (1)

2. (HL) side of ADD/ADDC/SUB/SUBB/AND/OR/XOR (src), (HL)

2.2.1

Port P2 (P20)

Port P2 is a 1bit input/output port. It is also used as an external interrupt input, and a

STOP mode release signal input. When used as an input port, or a secondary function pin,

the output latch should be set to “1”. During reset, the output latch is initialized to “1”.

It is recommended that pin P20 should be used as an external interrupt input, a STOP

mode release signal input, or an input port. If used as an output port, the interrupt latch is

set on the falling edge of the P20 output pulse.

When a read instruction for port P2 is executed, bits 7 to 1 in P2 are read in as undefined

data.

(00002H)

P20

INT

STOP

(Initial value: **** ***1)

Note:

*: Don’t care

Figure 2.2.2 Port P2

Data input

SET/CLR/CPI/others

STOP

OUTEN

Data input

Control input

Output latch

P20 (

INT

/ STOP )

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