HD404669 Datasheet, PDF (49/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
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 D₀ to D₃ pins are high source current input/output pins and the D₄, D₅, and D₉ to D₁₁ pins are
high sink current input/output pins. The D₁₂ and D₁₃ pins are input-only pins.
The D₀ to D₅ and D₉ to D₁₁ 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 D₀ to D₅ and D₉ to
D₁₁ pin output buffers on and off. The DCD registers are mapped to addresses in the RAM area. (figure 29.)
The D₁₂ and D₁₃ pins have shared functions as internal peripheral function pins and the STOPC and INT₀
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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