參數(shù)資料
型號(hào): HD404638R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位單片機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 42/133頁
文件大?。?/td> 803K
代理商: HD404638R
HD404639R Series
42
Input/Output
The MCU has 61 input/output pins (D
0
–D
11
, R0
0
–RC
0
) and 7 input pins (D
12
, D
13,
RD
0
–RD
3
, RE
0
). The
features are described below.
A maximum current of 15 mA is allowed for each of the pins D
4
to D
11
with a total maximum current of
less than 105 mA. In addition, D
0
–D
3
can each act as a 10-mA maximum current source.
Some input/output pins are multiplexed with peripheral function pins such as those for the timers or
serial interface. For these pins, the peripheral function setting is done prior to the D or R port setting.
Therefore, when a peripheral function is selected for a pin, the pin function and input/output selection
are automatically switched according to the setting.
Input or output selection for input/output pins and port or peripheral function selection for multiplexed
pins are set by software.
Peripheral function output pins are CMOS output pins. Only the R4
3
/SO
1
and R5
3
/SO
2
pins can be set to
NMOS open-drain output by software.
In stop mode, the MCU is reset, and therefore peripheral function selection is cancelled. Input/output
pins are in high-impedance state.
Pins D
0
–D
3
have built-in pull-down MOS, and other input/output pins have built-in pull-up MOS, which
can be individually turned on or off by software.
I/O buffer configuration is shown in figure 27, programmable I/O circuits are listed in table 21, and I/O pin
circuit types are shown in table 22.
Table 21-1 Programmable I/O Circuits (with Pull-Up MOS)
MIS3 (Bit 3 of MIS)
0
1
DCD, DCR
0
1
0
1
PDR
0
1
0
1
0
1
0
1
CMOS buffer
PMOS
On
On
NMOS
On
On
Pull-up MOS
Note:
On
On
— indicates off status.
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