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| 型號(hào)： | M38C37ECMFS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CQCC80 |
| 封裝： | 0.80 MM PITCH, GLASS SEALED, CERAMIC, LCC-80 |
| 文件頁(yè)數(shù)： | 194/223頁(yè) |
| 文件大小： | 1698K |
| 代理商： | M38C37ECMFS |
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2-8
38C3 Group User’s Manual
APPLICATION
2.1 I/O port
2.1.4 Notes on I/O port
(1)
Notes in standby state
In standby state]1 for low-power dissipation, do not make input levels of an input port and an I/O port
“undefined”.
Pull-up (connect the port to VCC) or pull-down (connect the port to VSS) these ports through a
resistor.
When determining a resistance value, note the following points:
External circuit
Variation of output levels during the ordinary operation
When using built-in pull-up resistor, note on varied current values:
When setting as an input port : Fix its input level
When setting as an output port : Prevent current from flowing out to external
l Reason
The potential which is input to the input buffer in a microcomputer is unstable in the state that input
levels of a input port and an I/O port are “undefined”. This may cause power source current.
]1 standby state: stop mode by executing STP instruction
wait mode by executing WIT instruction
(2)
Modifying port latch of I/O port with bit managing instruction
When the port latch of an I/O port is modified with the bit managing instruction]2, the value of the
unspecified bit may be changed.
l Reason
The bit managing instructions are read-modify-write form instructions for reading and writing data
by a byte unit. Accordingly, when these instructions are executed on a bit of the port latch of an
I/O port, the following is executed to all bits of the port latch.
As for bit which is set for input port:
The pin state is read in the CPU, and is written to this bit after bit managing.
As for bit which is set for output port:
The bit value is read in the CPU, and is written to this bit after bit managing.
Note the following:
Even when a port which is set as an output port is changed for an input port, its port latch holds
the output data.
As for a bit of which is set for an input port, its value may be changed even when not specified
with a bit managing instruction in case where the pin state differs from its port latch contents.
]2 Bit managing instructions: SEB and CLB instructions
(3)
Pull-up/Pull-down control
When each port which has built-in pull-up/pull-down resistor (P0, P1, P2, P4, P50, P52–P57, P6, P7,
P8) is set to output port, pull-up/pull-down control of corresponding port become invalid. (Pull-up/Pull-
down cannot be set.)
l Reason
Pull-up control is valid only when each direction register is set to the input mode.
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| M38C37ECMFP | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| M38C37ECMFS | 8-BIT, UVPROM, 4 MHz, MICROCONTROLLER, CQCC80 |
| M38C37ECMXXXFP | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| M38C59GFHP#U0 | 制造商:Renesas Electronics Corporation 功能描述:MCU 2/4V 60K PB-FREE - Trays |
| M38D20F1XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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| M38D20F2XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38D20F2XXXHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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