參數(shù)資料
型號(hào)： HD40A4354S
廠商： Hitachi,Ltd.
英文描述： 4-bit HMCS400-Series microcomputer
中文描述： 4位HMCS400系列微機(jī)
文件頁(yè)數(shù)： 37/100頁(yè)
文件大小： 398K
代理商： HD40A4354S
HD404358 Series
37
D Port (D
0
–D
8
):
Consist of 9 input/output pins addressed by one bit.
Pins D
0
–D
8
are set by the SED and SEDD instructions, and reset by the RED and REDD instructions.
Output data is stored in the port data register (PDR) for each pin. All pins D
0
–D
8
are tested by the TD and
TDD instructions.
The on/off statuses of the output buffers are cont ol ed by D-port dat a control regis ers (DC D0–DC D2: $02C–
$02E) that are mapped to memory addresses (figure 21).
Pins D0–D2, D4 are multiplexed with peripheral function pins
INT0
,
INT1
, EVNB, and
STOPC
,
respectively. The peripheral function modes of these pins are selected by bits 0–3 (PMRB0–PMRB3) of
port mode register B (PMRB: $024) (figure 22).
Pin D
3
is multiplexed with peripheral function pin BUZZ. The peripheral function mode of this pin is
selected by bit 3 (PMRA3) of port mode register A (PMRA: $004) (figure 23).
R Ports (R0
0
–R4
3
, R8):
24 input/output pins addressed in 4-bit units. Data is input to these ports by the
LAR and LBR instructions, and output from them by the LRA and LRB instructions. Output data is stored
in the port data register (PDR) for each pin. The on/off statuses of the output buffers of the R ports are
controlled by R-port data control registers (DCR0–DCR4: $030–$034, DCR8: $038) that are mapped to
memory addresses (figure 21).
Pin R0
0
is multiplexed with peripheral function pin
SCK
. The peripheral function mode of this pin is
selected by bit 3 (SMR3) of serial mode register (SMR: $005) (figure 24).
Pins R0
1
–R0
3
are multiplexed with peripheral pins SI, SO and TOC, respectively. The peripheral function
modes of these pins are selected by bits 0–2 (PMRA0–PMRA2) of port mode register A (PMRA: $004), as
shown in figures 23.
Port R3 is multiplexed with peripheral function pins AN
0
–AN
3
, respectively. The peripheral function
modes of these pins can be selected by individual pins, by setting A/D mode register 1 (AMR1: $019)
(figure 25).
Ports R4 is multiplexed with peripheral function pins AN
4
–AN
7
, respectively. The peripheral function
modes of these pins can be selected in 4-pin units by setting bit 1 (AMR21) of A/D mode register 2
(AMR2: $01A) (figure 26).
Pull-Up MOS Transistor Control:
A program-controlled pull-up MOS transistor is provided for each
input/output pin. The on/off status of all these transistors is controlled by bit 3 (MIS3) of the miscellaneous
register (MIS: $00C), and the on/off status of an individual transistor can also be controlled by the port data
register (PDR) of the corresponding pin—enabling on/off control of that pin alone (table 21 and figure 27).
The on/off status of each transistor and the peripheral function mode of each pin can be set independently.
How to Deal with Unused I/O Pins:
I/O pins that are not needed by the user system (floating) must be
connected to V
CC
to prevent LSI malfunctions due to noise. These pins must either be pulled up to V
CC
by
their pull-up MOS transistors or by resistors of about 100 k
.
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HD40A4358 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:microcomputer has an A/D converter,
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