參數(shù)資料
型號: HD407A4669
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
中文描述: 低電壓如同在微機芯片的DTMF產(chǎn)生電路(帶雙音多頻電路的低電壓微計算機)
文件頁數(shù): 49/142頁
文件大?。?/td> 894K
代理商: HD407A4669
HD404669 Series
49
D Port
The D port consists of 9 input/output pins and 2 input-only pins that can be addressed individually on a per-
bit basis. The D
0
to D
3
pins are high source current input/output pins and the D
4
, D
5
, and D
9
to D
11
pins are
high sink current input/output pins. The D
12
and D
13
pins are input-only pins.
The D
0
to D
5
and D
9
to D
11
pins can be set or reset by the SED/RED and SEDD/REDD instructions. The
output data is stored in the port data register for the pin. All the D port pins can be tested using the TD and
TDD instructions.
The D port data control registers (DCD0 to DCD2: $02C to $02E) are used to turn the D
0
to D
5
and D
9
to
D
11
pin output buffers on and off. The DCD registers are mapped to addresses in the RAM area. (figure 29.)
The D
12
and D
13
pins have shared functions as internal peripheral function pins and the
STOPC
and
INT
0
pins. Port mode register C (PMRC: $025) bits 2 and 3 (PMRC2 and PMRC3) are used to switch the
functions of these pins. (figure 32.)
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參數(shù)描述
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