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參數(shù)資料
| 型號(hào)： | HD4043612 |
| 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系列微機(jī)（4位單片微計(jì)算機(jī)） |
| 文件頁(yè)數(shù)： | 48/115頁(yè) |
| 文件大小： | 710K |
| 代理商： | HD4043612 |
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HD404369 Series
48
D Port (D
0
–D
13
):
Consist of 14 input/output pins addressed by one bit.
Pins D
0
–D
13
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
13
are tested by the TD and
TDD instructions.
The on/off statuses of the output buffers are controlled by D-port data control registers (DCD0–DCD3:
$02C–$02F) that are mapped to memory addresses (figure 28).
Pins D
0
–D
2
, D
4
are multiplexed with peripheral function pins
INT
0
,
INT
1
, 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 29).
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 30).
R Ports (R0
0
–R9
3
):
39 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–DCR9: $030–$039) that are mapped to memory addresses (figure
28).
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 31).
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 figure 30.
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 32).
Ports R4 and R5 are multiplexed with peripheral function pins AN
4
–AN
11
, respectively. The peripheral
function modes of these pins can be selected in 4-pin units by setting bits 1 and 2 (AMR21, AMR22) of
A/D mode register 2 (AMR2: $01A) (figure 33).
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 34).
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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PDF描述 |
|---|---|
| HD404369 | 4-bit HMCS400-Series microcomputer |
| HD404369H | 4-bit HMCS400-Series microcomputer |
| HD404369S | 4-bit HMCS400-Series microcomputer |
| HD404369F | 4-bit HMCS400-Series microcomputer |
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