tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 157

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Input/Output Ports
7.4 Port 3 (P30 through P37)
The port 3 is a general-purpose, 8-bit input/output port. For this port, inputs and outputs can be specified in units
of bits by using the control register P3CR and the function registers P3FC1 and P3FC2.
Besides the input/output port function, the port 3 performs other functions: P34 outputs a 16-bit timer, and P32,
P35 through P37 perform the 32-bit capture and trigger input function. These functions are enabled by setting
the corresponding bit of P3FC2 to "1." A reset allows P3CR, P3FC1 and P3FC2 to be cleared to "0" and the port
3 to function as an input port. Input is disabled right after reset. To enable input, set the corresponding bit of
P3IE to “1”.
In addition to above functions, a function of inputting and outputting the control and status signals of CPU is
provided. If the P30 pin is set to RD signal output mode (<P30F>="1"), the RD strobe is output only when an
external address area is accessed. Likewise, if the P31 pin is set to WR signal output mode (<P31F>="1"), the
WR strobe is output only when an external address area is accessed.
P3 read
(function control)
(output control)
(output control)
(input control)
(output latch)
P3PUP
P3FC1
P3CR
P3IE
Drive disabled during
P3
STOP/ RESET
External bus
opening
RD,WR
0
1
1
0
External bus
TMP19A44 (rev1.3) 7-9
Fig. 7.4 Port 3 (P30, P31)
opening
0
1
0
1
PORT KEEP
TMP19A44
2010-04-01
Port 3
P30,P31 (RD,WR)
RESET