參數(shù)資料
型號(hào)： HD404341R
廠商： Hitachi,Ltd.
英文描述： 4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī))
中文描述： 4位HMCS400系列微電腦（4位單片微計(jì)算機(jī)）
文件頁(yè)數(shù)： 44/100頁(yè)
文件大?。?/td> 610K
代理商： HD404341R
HD404344R Series/HD404394 Series
44
D Port
The D port consists of six input/output pins each addressed by one bit.
The D ports can be set and reset by SED/RED and SEDD/REDD instructions. Output data is stored in the
port data register (PDR) for each pin. Also, all D ports can tested by the TD/TDD instructions.
The on/off status of the output buffers is controlled by the D-port data control registers (DCD0, DCD1:
$02C and $02D), which are mapped to memory addresses (figure 19).
Pins D
0
and D
4
are multiplexed with peripheral function pins
INT
0
/EVNB, and
STOPC
. Setting of the
peripheral functions for these pins is executed by bits 3 and 0 (PMRB3, PMRB0) of port mode register B
(PMRB: $024) (figure 20).
Bit
Initial value
Read/Write
Bit name
3
0
W
2
0
W
0
0
W
1
0
W
DCD0, DCD1
DCR0 to DCR3
Data control register
(DCD0, DCD1: $02C, $02D)
(DCR0 to DCR3: $030 to $033)
DCR00
to
DCR30
DCR01
to
DCR31
Bits 0 to 3
0
CMOS Buffer Control
CMOS buffer off
(high impedance)
CMOS buffer on
Register
DCD0
DCD1
DCR0
DCR1
DCR2
DCR3
Bit 3
D
—
R0
3
R1
3
R2
3
Correspondence between ports and DCR bits
Bit 2
—
R0
2
R1
2
R2
2
R3
2
Bit 1
D
R0
1
R1
1
R2
1
R3
1
Bit 0
D
R0
0
R1
0
R2
0
R3
0
1
DCD01
to
DCD11
DCD00
to
DCD10
D
D
D
R3
3
*
Note:
*
Available for the HD404344R series and HD4074344, but not available for the HD404394 series.
DCD03
DCD02
DCR02
to
DCR32
DCR03
to
DCR33
3
2
1
0
5
4
Figure 19 Data Control Register (DCR)
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