Pin Names And Func T Ions - Toshiba TLCS-90 Series Data Book

TOSHIBA
TMP90C840
2.2 Pin Names and Functions
The names of input/ output pins and their funct ions are summarized
~n
Table 2.2.
Table 2.2 Pin Names and Functions
Function
Port 0: 8-bit I/O port that allows selec-
tion of input/output on byte basis
Data bus: Also functions as 8-bit bidirec-
tional data bus for external memory
Port 1: 8-bit I/O port that allows selec-
tion on byte basis
Address bus: The lower 8 bits function as
address bus for external memory
Port 2: 8-bit I/O port that allows selec-
tion on bit basis /
--------------------------------------------1
Address bus: The upper 8 bits function as /
address bus for external memory
1
Port 30: I-bit input port /
/--------------------------------------------1
1
Serial data receiving
1
1
Port 31: I-bit input port /
1--------------------------------------------/
1
Serial data receiving /
1
Port 32: l-bit output port /
1--------------------------------------------/
1
Serial data transmission /
/--------------------------------------------/
/ Request serial data transmission
1
/--------------------------------------------/
/ Serial clock output
1
1
Port 33: I-bit output port
1
1--------------------------------------------1
1
Serial data transmission /
/ Port 34: l-bit input port
1
/--------------------------------------------1
1
Ca able of serial data transmission /
Port 35: I-bit output port
1
1--------------------------------------------1
1
Read: Generates strobe signal for reading
1
1
external memory
1
1
Port 36: l-bit output port
1
/--------------------------------------------1
1
Write: Generates strobe signal for writing
1
1
into external memory
1
1
Port 37: l-bit input port
1
1--------------------------------------------1
1
Wait: Input pin for connecting slow accessl
1
memory or peripheral LSI
1
MPU90-5