tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 127

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA005
8.3.7 Port P9 (P91 to P90)
Peripheral
functions
UART1
used as the UART.
MOS output can be selected. Port P9 contains a programmable pull-up resistor on the VDD side. This pull-up
resistor can be used when the port is used in the input mode or as a sink open drain output.
details, refer to "8.4 Serial Interface Selecting Function".
Port P9 is a 2-bit input/output port that can be set to input or output for each bit individually, and it is also
The output circuit has the P-channel output control function and either the sink open drain output or the C-
When this port is used as the UART, setting for the serial interface selecting function is also needed. For
Table 8-16 Port P9
Secondary
function
P9PRD read
SYSCR1<OUTEN>
Input/output control
SYSCR1<STOP>
Function control
-
P9OUTCR write
Pull-up control
Output control
(for each bit)
(for each bit)
(for each bit)
(for each bit)
(for each bit)
Output latch
P9PU write
P9CR write
P9FC write
P9DR write
Reset signal
-
TXD1
Figure 8-9 Port P9
0
1
-
S
RXD1
Page 113
-
-
-
VDD
RXD1
TXD1
P91
Note1 : R = 100Ω (typ.)
Note2 : R
Note3 : i = 0 to 1
RXD1
TXD1
IN3
P90
= 50kΩ (typ.)
Programmable
pull-up resistor
R
R
VDD
IN3
TMP89FM42
P9i