Port 0 (Poo - P07) - Toshiba TLCS-90 Series Data Book

TOSHIBA TMP90C840
Table 3.5 Functions of Ports
Port I Pin name INa. ofl Direction IDirection set unitl Pin name for
name I I pins I I I internal function
Port 0 I POO - P071 8 I I/O I Byte I DO - D7 I
------1----------1------1-----------1------------------1-------------------1
Port 11 PIO - P171 8 I I/O I Byte I AO - A7 I
------1----------1------1-----------1------------------1-------------------1
Port 21 P20 - P271 8 1 I/O 1 Bit 1 A8 - AIS 1
------1----------1------1-----------1------------------1-------------------1
Port 31 P30 1 1 1 Input 1 RxD 1
1 P31 1 I 1 Input 1 RxD 1
1 P32 1 1 1 Output 1 TxD/RTS/SCLK
1 P33 1 I 1 Output 1 TxD
1 P34 1 1 1 Input 1 CTS
1 P3S I I lOut put I RD
1 P36 I I 1 Output 1 WR
I P37 1 1 1 Input 1 WAIT
------1----------1------1----------- ------------------1-------------------
1 Port 41 P40 - P431 4 1 Output 1 A16 - Al9
1------1----------1------1----------- ------------------1-------------------
IPort SI PSO - PSSI 6 I Input I ANO - ANS
1------1----------1------1----------- ------------------1-------------------
1 Port 61 P60 - P631 4 1 I/O Bit 1 MOO - M03/T01
1------1----------1------1----------- ------------------1-------------------
1 Port .71 P70 - P731 4 1 I/O Bit 1 MIO - Ml3/T03
1------1----------1------1----------- ------------------1-------------------1
1 Port 81 P80 1 I 1 Input 1 INTO 1
1 1 P81 1 1 1 Input 1 INTI/TI4 1
1 1 p82 1 1 1 Input 1
INT2/TIS
1
1 1 P83 1 I 1 Output 1 T03/T04 1
These port pins function as the general-purpose input/output ports by
reset t ing. The port pins, for wh ich input or output is programmably
selectable, function as input ports by resetting. A separate program is
required to use them for an internal function.
The TMP90C841 functions in the same way as the TMP90C840 except:
a Port 0 always functions as a data bus (DO to D7).
a Port I always functions as Address bus (AO to A7).
a Port 2 always functions as Address bus (A8 to AlS).
a P3S, P36 and P37 of Port 3 always function as RD, WR and WAIT
pins, respectively.
3.S.1 Port 0 (POO - P07)
Port 0 is an 8-bit general-purpose I/O port (PO: memory address FFCOH)
whose I/O function is specified by the control register (POC: bit 0 of
memory address FFC2H) for each byte. By resetting all bits of the
control register are initialized to "0", whereby Port 0 turns to the
input mode, and the contents of the output latch register are
undefined.
MPU90-SS