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| 型號(hào)： | SAF-C513A-HN |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, EEPROM, 8 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 70/128頁(yè) |
| 文件大?。?/td> | 1837K |
| 代理商： | SAF-C513A-HN |
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On-Chip Peripheral Units
Semiconductor Group
6-13
6.1.4.2 Port Loading and Interfacing
The output buffers of ports 1, 2 and 3 can drive TTL inputs directly. The maximum port load which
still guarantees correct logic output levels can be be seen in the Data Sheet of the SAB-C511/513
family members. The corresponding DC parameters are
V
OL and VOH.
The same applies to port 0 output buffers. They do, however, require external pullups to drive
floating inputs, except when being used as the address/data bus.
When used as inputs it must be noted that the ports 1, 2 and 3 are not floating but have internal
pullup transistors. The driving devices must be capable of sinking a sufficient current if a logic low
level shall be applied to the port pin (the parameters
I
TL and IIL in the DC characteristics specify
these currents). Port 0 has floating inputs when used for digital input.
6.1.4.3
Read-Modify-Write Feature of Ports 1, 2 and 3
Some port-reading instructions read the latch and others read the pin (see figure 6-13). The
instructions reading the latch rather than the pin read a value, possibly change it, and then rewrite
it to the latch. These are called "read-modify-write"- instructions, which are listed in table 6-4. If the
destination is a port or a port pin, these instructions read the latch rather than the pin. Note that all
other instructions which can be used to read a port, exclusively read the port pin. In any case,
reading from latch or pin, resp., is performed by reading the SFR P0, P1, P2 and P3; for example,
"MOV A, P1" reads the value from port 3 pins, while "ANL P1, #0AAH" reads from the latch, modifies
the value and writes it back to the latch.
It is not obvious that the last three instructions in table 6-4 are read-modify-write instructions, but
they are. The reason is that they read the port byte, all 8 bits, modify the addressed bit, then write
the complete byte back to the latch.
Table 6-4
"Read-Modify-Write"-Instructions
Instruction
Function
ANL
Logic AND; e.g. ANL P1, A
ORL
Logic OR; e.g. ORL P2, A
XRL
Logic exclusive OR; e.g. XRL P3, A
JBC
Jump if bit is set and clear bit; e.g. JBC P1.1, LABEL
CPL
Complement bit; e.g. CPL P3.0
INC
Increment byte; e.g. INC P1
DEC
Decrement byte; e.g. DEC P1
DJNZ
Decrement and jump if not zero; e.g. DJNZ P3, LABEL
MOV Px.y,C
Move carry bit to bit y of port x
CLR Px.y
Clear bit y of port x
SETB Px.y
Set bit y of port x
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| SAF-C517A-4R24M | 8-BIT, MROM, 24 MHz, MICROCONTROLLER, PQFP100 |
| SAF-C868-1RR | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO38 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAF-C513AO | 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-bit CMOS Microcontroller |
| SAF-C515 | 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAF-C515-1R24M | 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAF-C515-1RM | 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAF-C515A-4R | 制造商:INFINEON 制造商全稱(chēng):Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
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