參數(shù)資料
型號: MB91340PMT
元件分類: 微控制器/微處理器
英文描述: 32-BIT, MROM, 66 MHz, RISC MICROCONTROLLER, PQFP176
封裝: PLASTIC, LQFP-176
文件頁數(shù): 73/126頁
文件大小: 1501K
代理商: MB91340PMT
MB91340/MB91V340
50
2.
I/O Ports
MB91340/MB91V340 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
I/O port registers
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)
When port is in input mode (PFR
= “0” & DDR = “0”)
PDR read : Reads the level of the corresponding external pin.
PDR write : PDRWrites 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
DDR
PDR
PFR
PCR
: Data Direction Register
: Port Data 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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