tmp1940cyaf TOSHIBA Semiconductor CORPORATION, tmp1940cyaf Datasheet - Page 92

• Manufacturer Part Number: tmp1940cyaf
• Description: 32-bit Tx System Risc Tx19 Family
• Manufacturer: TOSHIBA Semiconductor CORPORATION

7.5
Port 4 (P40–P44)
programmable chip select ( CS0 – CS3 ) pins. P44 can be programmed to function as either a general-purpose
I/O pin or a system clock output (SCOUT) pin.
and P4FC register bits are cleared, configuring all the Port 4 pins as input port pins; P40–P43 have an
internal pullup resistor. Upon reset, the Output Latch (P4) is set to all 1s.
P40–P43 can be individually programmed to function as either discrete general-purpose I/O pins or
The P4CR and P4FC registers select the direction and function of the Port 4 pins. Upon reset, the P4CR
Direction Control
Function Control
Output Latch
P4CR Write
P4FC Write
P4 Write
(bitwise)
(bitwise)
Reset
S
Figure 7.10 Port 4 (P40–P43)
CS0 , CS1 , CS2 , CS3
TMP1940CYAF-50
A
B
S
P4 Read
Output Buffer
P-ch
TMP1940CYAF
Pullup Resistor
Programmable
P40 ( CS0 )
P41 ( CS1 )
P42 ( CS2 )
P43 ( CS3 )