參數(shù)資料
型號: MB91V301A
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 68 MHz, RISC MICROCONTROLLER, CPGA179
封裝: CERAMIC, PGA-179
文件頁數(shù): 98/140頁
文件大小: 2841K
代理商: MB91V301A
MB91301 Series
60
DS07-16502-4E
2.
I/O Ports
MB91301 series pins can be used as I/O ports when not set for use by the external bus interface or the various
peripheral I/O functions.
I/O port (with pull-up resistor) block diagram
Note : For port output, the pull-up resistor is disabled irrespective of the setting.
I/O ports with pull-up resistors have the following registers :
PDR (Port Data Register)
DDR (Data Direction Register)
PFR (Port Function Register)
PCR (Pull-up Control Register)
I/O ports have three following modes
When port is in input mode (PFR
= 0 & DDR = 0)
PDR read : Reads the level of the corresponding external pin.
PDR write : Writes the value to the PDR.
When port is in output mode (PFR
= 0 & DDR = 1)
PDR read : Reads the PDR value.
PDR write : Outputs the PDR value to the corresponding external pin.
When port is in peripheral output mode (PFR
= 1 & DDR = X)
PDR
: Reads the value of the corresponding peripheral output.
PDR write : Writes the value to the PDR.
Port Bus
0
1
0
Pin
PDR
PFR
DDR
PCR
PDR
DDR
PFR
PCR
: Port Data Register
: Data Direction Register
: Port Function Register
: Pull-up Control Register
Peripheral output
PDR read
Peripheral input
Pull-up resistor
(approx. 25 k
)
PCR
= 0 : No pull-up resistor
PCR
= 1 : Use pull-up resistor
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