参数资料
型号: MC68HC805P18CP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, EEPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 4/144页
文件大小: 1292K
代理商: MC68HC805P18CP
Serial Input/Output Port (SIOP)
SIOP Signal Format
MC68HC(8)05P18 — Rev. 2.0
Advance Information
MOTOROLA
Serial Input/Output Port (SIOP)
101
Figure 11-2. SIOP Timing Diagram
The master and slave modes of operation differ only by the sourcing of
SCK. In master mode, SCK is driven from an internal source within the
MCU. In slave mode, SCK is driven from a source external to the MCU.
The SCK frequency is programmable via the mask option register 1
(MOR1). Available rates are OSC divided by 2, 4, 8, or 16.
NOTE:
OSC divided by 2 is four times faster than the standard rate available on
the 68HC05P6.
Refer to 8.5 Mask Option Registers for a description of available mask
option registers.
11.3.2 Serial Data Input (SDI)
The SDI pin becomes an input as soon as the SIOP subsystem is
enabled. New data is presented to the SDI pin on the falling edge of
SCK. Valid data must be present at least 100 nanoseconds before the
rising edge of SCK and remain valid for 100 nanoseconds after the rising
edge of SCK. See Figure 11-2.
SCK
SDO
SDI
100 ns
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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