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參數(shù)資料
型號(hào): MC68C912B32FU8
廠商: MOTOROLA INC
元件分類(lèi): 微控制器/微處理器
英文描述: 16-Bit Microcontroller
中文描述: 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁(yè)數(shù): 17/128頁(yè)
文件大小: 748K
代理商: MC68C912B32FU8
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MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
17
Register DDRT determines pin direction of port T when used for general-purpose I/O. When DDRT bits
are set, the corresponding pin is configured for output. On reset the DDRT bits are cleared and the cor-
responding pin is configured for input.
When the PUPT bit in the TMSK2 register is set, all input pins are pulled up internally by an active pull-
up device. Pull-ups are disabled after reset.
Setting the RDPT bit in the TMSK2 register configures all port T outputs to have reduced drive levels.
Levels are at normal drive capability after reset. The TMSK2 register can be read or written anytime
after reset. Refer to
12 Standard Timer Module
.
3.4.8 Port S
Port S is the 8-bit interface to the standard serial interface consisting of the serial communications in-
terface (SCI) and serial peripheral interface (SPI) subsystems. Port S pins are available for general-pur-
pose parallel I/O when standard serial functions are not enabled.
Port S pins serve several functions depending on the various internal control registers. If WOMS bit in
the SC0CR1
register is set, the P-channel drivers of the output buffers are disabled for bits 0 through 1
(2 through 3). If SWOM bit in the SP0CR1 register is set, the P-channel drivers of the output buffers are
disabled for bits 4 through 7. (wired-OR mode). The open drain control effects both the serial and the
general-purpose outputs. If the RDPSx bits in the PURDS register are set, the appropriate port S pin
drive capabilities are reduced. If PUPSx bits in the PURDS register are set, the appropriate pull-up de-
vice is connected to each port S pin which is programmed as a general-purpose input . If the pin is pro-
grammed as a general-purpose output, the pull-up is disconnected from the pin regardless of the state
of the individual PUPSx bits. See
13 Serial Interface
.
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