參數(shù)資料
型號(hào)： HCD404344R
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)： 17/212頁(yè)
文件大?。?/td> 700K
代理商： HCD404344R
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Rev. 1.0, 03/99, page 14 of 209
g. The R0 port in the H4344/H4318/H4359/H4369 Series, and the R1 port in the H4889
Series are 4-bit I/O ports. The LAR and LBR commands are used for 4-bit input, and the
LRA and LRB commands for 4-bit output of both ports. The output data is stored in the
PDR of the respective pin. In this example task, the R0
3
pin in the H4344/H4318/H4359/
H4369 Series and the R1
2
pin the H4889 Series are set for output, and output a pulse to a
speaker. Table 3 describes the functions of the R0 port in the H4344/H4318/H4359/H4369
Series and the R1 port in the H4889 Series.
Table 3
Description of R0 Port Functions in H4344/H4318/H4359/H4369 Series and
R1 Port Functions in H4889 Series
Data Control Register R0 (DCR0)
Note: Applies to H4344/H4318/H4359/H4369 Series
Function
DCR0 switches the I/O pin function of the R0 port. When any bit of DCR0 is cleared
to “0”, the output buffer (CMOS) of the corresponding pin is turned OFF and the
output is set to high impedance. When the respective bit of DCR0 is set to “1”, the
output buffer of the corresponding pin is set ON and the corresponding PDR value is
output.
Data Control Register R1 (DCR1)
Note: Applies to H4889 Series
Function
DCR1 switches the I/O pin function of the R1 port. When any bit of DCR1 is cleared
to “0”, the output buffer (CMOS) of the corresponding pin is turned OFF and the
output is set to high impedance. When the respective bit of DCR1 is set to “1”, the
output buffer of the corresponding pin is set ON and the corresponding PDR value is
output.
Port Mode Register A (PMRA)
Note: Applies to H4344/H4318/H4359/H4369 Series
Function
PMRA is a 4-bit write-only register. Bits PMRA2 to PMRA0 switch the dual-function
R0 port pins.
Port Mode Register 2 (PMR2)
Note: Applies to H4889 Series
Function
PMR2 is a 4-bit write-only register. Bits PMR23 to PMR20 switch the dual-function R1
port pins.
Port Data Register (PDR)
Function
The I/O pins of the R ports have built-in PDRs to store the output data. When the LRA
and LRB commands are executed, the contents of the accumulator (A) and B register
(B) are transferred to the PDR of the specified R port. When the corresponding bit of
the DCR of the R port is “1”, the output buffer of the appropriate pin is set ON and the
value in the PDR is output via that pin. The PDR is initialized to $F at a reset.
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