3.7.5
Port 7 (P70 to P76)
Port7 is a 7-bit general-purpose I/O port (P70 is used for output only). Bits can be
individually set as either inputs or outputs by control register P7CR and function register
P7FC.
In addition to functioning as a general-purpose I/O port, P70 to P76 pins can also
function as interface-pins for external memory.
A reset initializes P70 pin to output port mode, and P71 to P76 pins to input port mode.
Setting the AM1 and AM0 pins as shown below and resetting the device initialize port 7
to the following function pins:
AM1
0
0
1
1
RD
Port read data
,
NDRE
NDWE
,
WRLL
WRLU
Port read data
Initial setting of P70 pin
AM0
Function Setting after reset is released
0
1
0
1
P7FC register
P7 register
P7CR register
P7FC register
P7 register
S
0
1
Selector
Selector
Figure 3.7.9 Port7
92CF30-99
Don't use this setting
RD pin
RD pin
Don't use this setting
S
0
1
Selector
S
0
1
Selector
S 1
0
TMP92CF30
P70 (
)
RD
P71 (
,
)
WRLL
NDRE
P72 (
,
)
NDWE
WRLU
2009-06-12