Rev. 3.0, 03/01, page 56 of 390
System Bus Control Register (SBCR) [cont’d]
Bit
Description
Default
15
PDOF: Port D Output Floating Control. When this bit is set, the output will be floating.
When this bit is cleared, the output floating is disabled.
0
14
PDIG: Port D Input Gating Control. When this bit is set, the input to port D will be gated to
fixed value. When this bit is cleared, the input remains unaffected.
0
13
PCOF: Port C Output Floating Control. When this bit is set, the output will be floating.
When this bit is cleared, the output floating is disabled.
0
12
PCIG: Port C Input Gating Control. When this bit is set, the input to port C will be gated to
fixed value. When this bit is cleared, the input remains unaffected.
0
11
PBOF: Port B Output Floating Control. When this bit is set, the output will be floating.
When this bit is cleared, the output floating is disabled.
0
10
PBIG: Port B Input Gating Control. When this bit is set, the input to port B will be gated to
fixed value. When this bit is cleared, the input remains unaffected.
0
9
PAOF: Port A Output Floating Control. When this bit is set, the output will be floating.
When this bit is cleared, the output floating is disabled.
0
8
PAIG: Port A Input Gating Control. When this bit is set, the input to port A will be gated to
fixed value. When this bit is cleared, the input remains unaffected.
0
7
Reserved
0
6
CSPE: CPU Chip Area Select Pull-up Enable. When this bit is cleared, the chip select
CS4_ will be pull-up. When this bit is set, the CS4_ is not pull-up.
0
5
CMDPE: CPU Command/Status Pull-up Enable. When this bit is cleared, the signal RD_,
RDWR_, WE0_ and WE1_ will be pull-up. When this bit is set, the signal RD_, RDWR_,
WE0_ and WE1_ are not pull-up.
0
4
ADDRPE: CPU Address Bus Pull-up Enable. When this bit is cleared, the address bus will
be pull-up. When this bit is set, the address bus is not pull-up.
0
3
DATAPE: CPU Data Bus Pull-up Enable. When this bit is set, the data bus will be pull-up.
When this bit is cleared, the data bus is not pull-up.
0
2
CPUBIG: CPU Bus interface Input Gating Control. When this bit is set, the CPU bus
interface will be automatic input gating by Intelligent Peripheral Controller Select(CS4_)
for reducing power consumption. When this bit is cleared, the CPU bus interface is not
gated.
0
0
PEOF: Port E Output Floating Control. When this bit is set, the output will be floating.
When this bit is cleared, the output floating is disabled.
0
0
PEIG: Port E Input Gating Control. When this bit is set, the input to port E will be gated to
fixed value. When this bit is cleared, the input remains unaffected.
0
Summary of Contents for HD64465
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