參數(shù)資料
型號: HD4074459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計算機(jī))
文件頁數(shù): 44/120頁
文件大小: 692K
代理商: HD4074459
HD404459 Series
44
Input/Output
The MCU has 49 input/output pins (D
0
–D
9
, R0–R8, R9
0
–R9
2
) and 7 input pins (D
10
, D
11
, R9
3
, RA). The
features are described as follows.
The D
11
, R0, R3–R6, R9
3
, and RA pins are multiplexed with peripheral function pins such as those for
timers or the serial interface. See table 24. 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. However, pins input to the
wakeup function are not switched. Only the valid/invalid statuses of wakeup input are controlled.
Peripheral function output pins are CMOS out-put pins. See table 23. Only the SO pin
and R4
3
port 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 set at high-impedance.
Each input/output pin has a built-in pull-up MOS (figure 29), which can be individually turned on or off
by software.
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