參數(shù)資料
型號: MC68HC05E5DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 137/140頁
文件大小: 847K
代理商: MC68HC05E5DW
NON-DISCLOSURE
AGREEMENT
REQUIRED
Synchronous Serial Interface (SSI)
General Release Specification
MC68HC05E5 Rev. 1.0
96
Synchronous Serial Interface (SSI)
MOTOROLA
12.3 SSI Signals
The following sections describe the SSI signals.
12.3.1 Serial Clock (SCK)
In master mode (MSTR = 1), the SCK pin is an output with a selectable
frequency of:
fop divided by 16 (SR1–SR0 = 00),
fop divided by 8 (SR1–SR0 = 01),
fop divided by 4 (SR1–SR0 = 10), or
fop divided by 2 (SR1–SR0 = 11).
This pin will be high (CPOL = 1) or low (CPOL = 0) between
transmissions.
In slave mode (MSTR = 0), the SCK pin is an input and the clock must
be supplied by an external master with a maximum frequency of fop
divided by 2. There is no minimum SCK frequency. This pin should be
driven high (CPOL = 1) or low (CPOL = 0) between transmissions by the
external master and must be stable before the SSI is first enabled
(SE = 1).
NOTE:
Data is always captured with the SDIO pin on the rising edge of SCK.
Data is always shifted out and presented at the SDIO pin on the falling
edge of SCK.
12.3.2 Serial Data Input/Output (SDIO)
This pin receives and transmits data to or from the SSI module as
described in the following paragraphs.
SDIO as an Output Pin
Prior to enabling the SSI (SE = 0), the SDIO pin will be three-stated.
The SDIO pin will be active when the SSI is enabled (SE = 1), the
serial direction (SDIR = 1) bit is set, and MSTR = 1. The state of the
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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