Rev. 3.0, 10/02, page 109 of 686
6.3.6
Pin Function Control Register (PFCR)
PFCR performs address output control in external extended mode.
Bit
Bit Name
Initial Value R/W
Description
7 to
4
–
0
R/W
Reserved
The write value should always be 0.
3
2
1
0
AE3
AE2
AE1
AE0
1/0
*
1/0
*
0
1/0
*
R/W
R/W
R/W
R/W
Address Output Enable 3 to 0:
These bits select enabling or disabling of address
outputs A8 to A23 in ROMless extended mode and
modes with ROM.
When a pin is enabled for address output, the address is
output regardless of the corresponding DDR setting.
When a pin is disabled for address output, it becomes an
output port when the corresponding DDR bit is set to 1.
0000:
A8 to A23 output disabled
0001:
A8 output enabled; A9 to A23 output disabled
0010:
A8, A9 output enabled; A10 to A23 output disabled
0011:
A8 to A10 output enabled; A11 to A23 output disabled
0100:
A8 to A11 output enabled; A12 to A23 output disabled
0101:
A8 to A12 output enabled; A13 to A23 output disabled
0110:
A8 to A13 output enabled; A14 to A23 output disabled
0111:
A8 to A14 output enabled; A15 to A23 output disabled
1000:
A8 t o A15 output enabled; A16 to A23 output disabled
1001:
A8 to A16 output enabled; A17 to A23 output disabled
1010:
A8 to A17 output enabled; A18 to A23 output disabled
1011:
A8 to A18 output enabled; A19 to A23 output disabled
1100:
A8 to A19 output enabled; A20 to A23 output disabled
1101:
A8 to A20 output enabled; A21 to A23 output disabled
1110:
A8 to A21 output enabled; A22, A23 output disabled
1111:
A8 to A23 output enabled
Note:
*
In modes 4 and 5, initial value of each bit is 1. In modes 6 and 7, initial value of each bit is
0.
Summary of Contents for H8S/2215 Series
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