參數(shù)資料
型號(hào)： HD404652S
廠商： Hitachi,Ltd.
英文描述： 4-Bit Single-Chip Microcomputer
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 39/109頁(yè)
文件大?。?/td> 430K
代理商： HD404652S
HD404654 Series
39
Pins D
12
and D
13
are multiplexed with peripheral function pins
STOPC
and
I NT
0
, respectively. The
peripheral function modes of these pins are selected by bits 2 and 3 (PMRC2, PMRC3) of port mode
register C (PMRC: $025) (figure 24).
R Ports (R0
0
, R1
0
–R4
3
, RD
0
, RD
1
, RE
0
):
17 input/output pins and 3 input 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) that
are mapped to memory addresses (figure 23).
Pin R0
0
is multiplexed with peripheral pin
INT
1
. The peripheral function mode of this pins is selected by
bit 0 (PMRB0) of port mode register B (PMRB: $024) (figure 25).
Pins R3
1
–R3
2
are multiplexed with peripheral pins TOC and TOD respectively. The peripheral function
modes of these pins are selected by bits 0–2 (TMC20–TMC22) of timer mode register C2 (TMC2: $014),
and bits 0–3 (TMD20–TMD23) of timer mode register D2 (TMD2: $015) (figures 26, and 27).
Pin R4
0
is multiplexed with peripheral pin EVND. The peripheral function mode of this pins is selected by
bit 1 (PMRC1) of port mode register C (PMRC: $025) (figure 24).
Pins R4
1
–R4
3
are multiplexed with peripheral pins
SCK
1
, SI
1
, and SO
1
, respectively. The peripheral
function modes of these pins are selected by bit 3 (SM1A3) of serial mode register 1A (SM1A: $005), and
bits 0 and 1 (PMRA0, PMRA1) of port mode register A (PMRA: $004), as shown in figures 28 and 29.
Ports RD
0
and RD
1
are multiplexed with peripheral function pins COMP
0
and COMP
1
, respectively. The
function modes of these pins are selected by bit 3 (CER3) of the compare enable register (CER: $018), as
shown in figure 30.
Port RE
0
is multiplexed with peripheral function pin VC
ref
. While functioning as VC
ref
, do not use this pin
as an R port at the same time, otherwise, the MCU may malfunction.
Pull-Up or Pull-Down MOS Transistor Control:
A program-controlled pull-up or pull-down MOS
transistor is provided for each input/output pin other than input-only pins D
12
and D
13
. 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 19 and figure 31).
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
or pulled down to GND by their pull-down
MOS transistors.
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參數(shù)描述
HD404654 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
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