tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 44

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

2.2.3
Port P2 (P22 to P20)
low-frequency crystal connection pins When used as an input port, or the secondary
function pin, the output latch should be set to “1”. During reset, the output latches are
initialized to “1”.
in the dual-clock mode. In the single-clock mode, pins P21 and P22 can be used as normal
input/output ports.
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 output pulse.
data.
Port P2 is a 3-bit input/output port. It is also used as an external interrupt input, and
A low-frequency crystal (32.768 kHz) is connected to pins P21 (XTIN) and P22 (XTOUT)
It is recommended that the P20 pin should be used as an external interrupt input, a
When a read instruction for port P2 is executed, bits 7 to 3 in P2 read in as undefined
Control input
Data output
Data output
Data output
XTEN
fs
Data input
Data input
Data input
P2
(00002H)
SET/CLR/CPL/others
Output latch
D Q
D Q
D Q
7
6
Figure 2.2.4 Port P2
CMP/MCMP/TEST/others
88CU74-44
5
Osc. enable
4
3
Note 1: *: Don’t care
Note 2: XTEN is bit 6 in SYSCR2
P20 (
P21 (XTIN)
P22 (XTOUT)
XTOUT
(Initial value: **** *111)
P22
2
INT
5
XTIN
/
P21
STOP
1
)
STOP
INT
P20
0
5
TMP88CU74
2007-10-19
2003-02-17