參數(shù)資料
型號(hào): S1C621A0F0A0100
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 108/161頁
文件大小: 1037K
代理商: S1C621A0F0A0100
I-26
EPSON
S1C621A0 TECHNICAL HARDWARE
CHAPTER 3: PERIPHERAL CIRCUITS (I/O Ports)
Input data
Independently of the value of the I/O control register, the I/O
port reads the value of the Pnm pin as data. Only during the
read operation, the Pnm pin is pulled up (see Figure 3.6.1).
This means that, in the input mode, the I/O port reads the
data given to the Pnm pin and, in the output mode, reads the
data loaded from the Pnm register to the Pnm pin.
I/O control (IOC)
register
With the Pnm pin used as input and the on-chip pull-up
resistor connected to it, an input error will result if the time
constant of the input line capacitive load and the on-chip
pull-up resistor is greater than the read time. Although the
pull-up time equals 1.5 times the wavelength of the system
clock, it is necessary to limit the potential at the pin to
within 0.5 times the wavelength. If this condition cannot be
satisfied, an externally connected pull-up resistor must be
used or the read operation repeated as many times as
necessary.
Notes on operation
with pull-up resistors
A register (named IOC) which controls the output state of
the I/O port (Pnm) on a 4-bit basis is assigned to 0FFH, D1
on the memory map. With 1 set in this register, the I/O
port (Pnm) works as output. With 0 set in the register, the
I/O port is a high-impedance state and can accept external
data, and pulled up only on reading operation. At initial
reset, the IOC register is set to 0.
相關(guān)PDF資料
PDF描述
S1C63158D0A010P 4-BIT, FLASH, 4 MHz, MICROCONTROLLER, UUC53
S1C7XXXF00E199 16-BIT, 90 MHz, RISC MICROCONTROLLER, PQFP
S2041 PHOTO TRANSISTOR DETECTOR
S3P44R10 TRIGGER OUTPUT SOLID STATE RELAY, 4000 V ISOLATION-MAX
S3S12P128J0VQK 16-BIT, MROM, 1.05 MHz, MICROCONTROLLER, PQFP80
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S1C63004 制造商:EPSON 制造商全稱:EPSON 功能描述:CMOS 4-bit Single Chip Microcontroller
S1C63008 制造商:EPSON 制造商全稱:EPSON 功能描述:CMOS 4-bit Single Chip Microcontroller
S1C63016 制造商:EPSON 制造商全稱:EPSON 功能描述:CMOS 4-bit Single Chip Microcontroller
S1C63158 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer
S1C63408 制造商:EPSON 制造商全稱:EPSON 功能描述:4-bit Single Chip Microcomputer