參數(shù)資料
型號(hào)： MC68HC16S2CPU20
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, 20.97 MHz, MICROCONTROLLER, PQFP100
封裝： TQFP-100
文件頁(yè)數(shù)： 76/104頁(yè)
文件大?。?/td> 640K
代理商： MC68HC16S2CPU20
MC68HC16S2
MOTOROLA
MC68HC16S2TS/D
73
5.4 SRAM Operation
There are five SRAM operating modes. They include the following:
1.
The RAM module is in normal mode when powered by VDD. The array can be accessed by byte,
word, or long word. A byte or aligned word (high-order byte is at an even address) access only
takes one bus cycle or two system clocks. A long word or misaligned word access requires two
bus cycles.
2.
Standby mode is intended to preserve RAM contents when VDD is removed. SRAM contents
are maintained by a power source connected to the VSTBY pin. The standby voltage is referred
to as VSB. Circuitry within the SRAM module switches to the higher of VDD or VSB with no loss
of data. When SRAM is powered from the VSTBY pin, access to the array is not guaranteed. If
standby operation is not desired, connect the VSTBY pin to VSS.
3.
Reset mode allows the CPU to complete the current bus cycle before resetting. When a syn-
chronous reset occurs while a byte or word SRAM access is in progress, the access is com-
pleted. If reset occurs during the first word access of a long-word operation, only the first word
access is completed. If reset occurs during the second word access of a long word operation,
the entire access is completed. Data being read from or written to the RAM may be corrupted
by asynchronous reset.
4.
Test mode is used for factory testing of the RAM array.
5.
Writing the STOP bit of RAMMCR causes the SRAM module to enter stop mode. The RAM ar-
ray is disabled which, if necessary, allows external logic to decode SRAM addresses but all
data is retained. If VDD falls below VSB, internal circuitry switches to VSB, as in standby mode.
Exit the stop mode by clearing the STOP bit.
相關(guān)PDF資料
PDF描述
MC68HC16Z1CFV25 16-BIT, 25 MHz, MICROCONTROLLER, PQFP144
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC16Z1CAG 制造商:Freescale Semiconductor 功能描述:
MC68HC16Z1CAG16 功能描述:16位微控制器 - MCU 16 BIT MCU 1K RAM RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
MC68HC16Z1CAG16 制造商:Freescale Semiconductor 功能描述:IC16-BIT MICROCONTROLLER
MC68HC16Z1CAG20 功能描述:16位微控制器 - MCU 16 BIT MCU 1K RAM RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
MC68HC16Z1CAG20 制造商:Freescale Semiconductor 功能描述:Microcontroller
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