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參數資料
型號: MC68HC916X1
廠商: Motorola, Inc.
英文描述: 16-Bit Modular Microcontroller(16位模塊化微控制器)
中文描述: 16位微控制器模塊(16位模塊化微控制器)
文件頁數: 122/172頁
文件大小: 1035K
代理商: MC68HC916X1
MOTOROLA
122
MC68HC916X1
MC68HC916X1TS/D
8.4 SRAM Operation
There are five SRAM operating modes. They include the following:
1.
The RAM module is in normal mode when powered by V
DD
. 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 ac-
cess requires two bus cycles.
Standby mode is intended to preserve RAM contents when V
DD
is removed. SRAM con-
tents are maintained by a power source connected to the V
STBY
pin. The standby voltage
is referred to as V
SB
. Circuitry within the SRAM module switches to the higher of V
DD
or
V
SB
with no loss of data. When SRAM is powered from the V
STBY
pin, access to the array
is not guaranteed. If standby operation is not desired, connect the V
STBY
pin to V
SS
.
Reset mode allows the CPU to complete the current bus cycle before resetting. When a
synchronous reset occurs while a byte or word SRAM access is in progress, the access is
completed. 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.
Test mode is used for factory testing of the RAM array.
Writing the STOP bit of RAMMCR causes the SRAM module to enter stop mode. The RAM
array is disabled which, if necessary, allows external logic to decode SRAM addresses but
all data is retained. If V
DD
falls below V
SB
, internal circuitry switches to V
SB
, as in standby
mode. Exit the stop mode by clearing the STOP bit.
2.
3.
4.
5.
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