Toshiba TLCS-900/L1 Series Manual page 64

3.5.4 Port 6 (P60 to P67)
Port 60 to 67 are 8-bit output ports. Resetting sets output latch of P62 to 0 and output
latches of P60 to P61, P63 to P67 to 1.
Port 6 also function as chip-select output (
Writing 1 in the corresponding bit of P6FC, P6FC2 enables the respective functions.
Resetting resets the P6FC, P6FC2 to 0, and sets all bits to output ports.
If set port 6, be careful of a setting because of chip select function.
Starting memory connects to CS2 pin, but this signal function as P62 after reset.
Therefore initialized value of output data of P62 is set to "0". If manage chip select by
connection many memory to outside, after program started, must to change port function
to chip select function in this program. If outputted "1" remain port function, program is
not run. Therefore data setting (P6) must to execute after function changing (P6FC).
Reset
Function
control 2
(on bit basis)
P6FC2 write
Funtion
(on bit basis)
P6FC write
P6 write
control
S
A
Output
Selector
B
lacth
C
1, 1, , 1,
CS2A
P6 read
, ,
CS0 CS1 CS2
Figure 3.5.7 Port 6
91C824-62
to ), extend address output (EA24).
CS0 CS3
P60 (
CS0
P61 (
CS1
P62 (
CS2
P63 (
CS3
P64 (EA24,
P65 (EA25,
P66 (
CS2D
P67 (
CS2E
CS2B
, , EA24, EA25
CS3
TMP91C824
),
),
, )
CS2A
),
)
CS2B
)
CS2C
)
)
2008-02-20