參數(shù)資料
型號(hào)： MSU2032
廠(chǎng)商： Mosel Vitelic, Corp.
英文描述： 8-Bit Single Chip Microcontroller with Serial Input / Output Port(帶串行輸入/輸出端口8位單芯片微控制器)
中文描述： 8位微控制器與單片機(jī)串行輸入/輸出端口（帶串行輸入/輸出端口8位單芯片微控制器）
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 93K
代理商： MSU2032
MSU2052/U2032
MOSEL VITELIC INC.
6/20
PID 252A 02/98
Specifications subject to change without notice, contact your sales representatives for the most recent information.
Power Down Mode
It saves the RAM content, stops the clock generator
and disables every other blocks' function until the
coming hardware reset. To save even more power
consumption, user's software program can invoke this
mode. The SFRs and the on-chip data RAM retain
their values during this mode, but the porcessor stops
executing instructions. In Power-Down mode (PD=1)
the oscillator is frozen.
-An instruction that sets flag (PCON.1) causes that to
be the last instruction executed before going into the
Power Down Mode.
-In the Power Down Mode, the on-chip oscillator is
stopped.
With the clock frozen, all functions are stopped, but
the on-chip RAM and Special Function Registers are
held.
-Reset redefines all the SFRs, but does not change the
on-chip RAM.
-There are two ways to terminate the Power Down
Mode.
1) By hardware reset
All SFR and PC value will be cleared to reset value.
2) One of CLK, DATA, PORT 2.0-2.7 transition to low
(falling edge trigger)
After the program wakes up, the PC value will be
0023h (if enable IE register) and execute interrupt
service routine and then returns to PC+1 address after
the program wakes up.
-Care must be taken, however, to ensure that VCC is
not reduced before the Power Down Mode is invoked,
and that VCC is restored to its normal operating level
before the Power Down Mode is terminated.
-The hardware reset must be held active long enough
to allow the oscillator to restart and stabilize.
General of above
User should fix the attention on using wake up from
port 2:
-The user should write the power down or idle mode
flag value to one RAM address before write PCON to
distinguish waking up from power down mode or idle
mode.
-After idle mode or power down mode wakes up, the
interrupt service routine will be executed first and then
executes PC+1 address if the IE register is enabled
before entering power down mode or idle mode. The
interrupt service routine will not be executed but CPU
executes PC+1 address program if disable IE register.
-After wake up power down or idle mode the IDF flag
will be set by hardware. The IDF flag be cleared at
the ISR execution time. If IE register is disable, the
IDF flag will not be cleared when power down or idle
mode wakes up.
Mode
Program
memory
ALE
#PSEN
Port 0
Port 1
Port 2
Port 3
Idle
Idle
Power Down
Power Down
Internal
External
Internal
External
1
1
0
0
1
1
0
0
Data
Float
Data
Float
Data
Data
Data
Data
Data
Address
Data
Data
Data
Data
Data
Data
The state of pins during Idle and Power-Down Mode
Symbol
V
dd
- Vss
V
IN
V
OUT
T (Operating)
T (Storage)
Name
DC supply Voltage
Input voltage
output voltage
Operating Temperature
Storage Temperature
Rating
-0.5 ~ +5.0
-0.5 ~ +7.0
Vss-0.3 ~ V
dd
+0.3
Vss ~ V
dd
0 ~ +70
-55 ~ +125
Unit
V
V
V
Absolute Maximal Rating
* Note:
Operation beyond Absolute Maximal Rating
can adversely affect device reliability.
C
C
Remark
U20x1L
U20x1S,U20x1C
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