參數(shù)資料
型號(hào): UPSD3432E-40T6T
廠商: 意法半導(dǎo)體
英文描述: Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic
中文描述: Turbo Plus系列高速渦輪8032 USB和可編程邏輯控制器
文件頁(yè)數(shù): 69/264頁(yè)
文件大小: 4320K
代理商: UPSD3432E-40T6T
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uPSD34xx - SUPERVISORY FUNCTIONS
The formula to determine WDT time-out period is:
WDT
PERIOD
= t
MACH_CYC
x N
OVERFLOW
N
OVERFLOW
is the number of WDT up-counts re-
quired to reach FFFFFFh. This is determined by
the value written to the SFR, WDRST.
t
MACH_CYC
is the average duration of one MCU
machine cycle. By default, an MCU machine cycle
is always 4 MCU_CLK periods for uPSD34xx, but
the following factors can sometimes add more
MCU_CLK periods per machine cycle:
The number of MCU_CLK periods assigned to
MCU memory bus cycles as determined in the
SFR, BUSCON. If this setting is greater than
4, then machine cycles have additional
MCU_CLK periods during memory transfers.
Whether or not the PFQ/BC circuitry issues a
stall during a particular MCU machine cycle. A
stall adds more MCU_CLK periods to a
machine cycle until the stall is removed.
t
MACH_CYC
is also affected by the absolute time of
a single MCU_CLK period. This number is fixed by
the following factors:
Frequency of the external crystal, resonator,
or oscillator: (f
OSC
)
Bit settings in the SFR CCON0, which can
divide f
OSC
and change MCU_CLK
As an example, assume the following:
1.
f
OSC
is 40MHz, thus its period is 25ns.
2.
CCON0 is 10h, meaning no clock division, so
the period of MCU_CLK is also 25ns.
3.
BUSCON is C1h, meaning the PFQ and BC
are enabled, and each MCU memory bus
cycle is 4 MCU_CLK periods, adding no
additional MCU_CLK periods to MCU
machine cycles during memory transfers.
4.
Assume there are no stalls from the PFQ/BC.
In reality, there are occational stalls but their
occurance has minimal impact on WDT
timeout period.
WDRST contains 00h, meaning a full 2
24
up-
counts are required to reach FFFFFh and
generate a reset.
In this example,
t
MACH_CYC
= 100ns (4 MCU_CLK periods x 25ns)
N
OVERFLOW
= 2
24
= 16777216 up-counts
WDT
PERIOD
= 100ns X 16777216
= 1.67 seconds
5.
The actual value will be slightly longer due to PFQ/
BC.
Firmware Example:
The following 8051 assem-
bly code illustrates how to operate the WDT. A
simple statement in the reset initialization firmware
enables the WDT, and then a periodic write to
clear the WDT in the main firmware is required to
keep the WDT from overflowing. This firmware is
based on the example above (40MHz f
OSC
,
CCON0 = 10h, BUSCON = C1h).
For example, in the reset initialization firmware
(the function that executes after a jump to the reset
vector):
Somewhere in the flow of the main program, this
statement will execute periodically to reset the
WDT before its time-out period of 1.67 seconds.
For example:
MOV AE, #AA
; enable WDT by writing value to
; WDKEY other than 55h
MOV A6, #00
; reset WDT, loading 000000h.
; Counting will automatically
; resume as long as 55h in not in
; WDKEY
相關(guān)PDF資料
PDF描述
UPSD3432E-40U6T Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic
UPSD3423 High Speed CMOS Logic Non-Inverting Octal Buffer/Line Drivers with 3-State Outputs 20-SOIC -55 to 125
UPSD3423E High Speed CMOS Logic Non-Inverting Octal Buffer/Line Drivers with 3-State Outputs 20-SOIC -55 to 125
UPSD3424 High Speed CMOS Logic Non-Inverting Octal Buffer/Line Drivers with 3-State Outputs 20-SOIC -55 to 125
UPSD3424E High Speed CMOS Logic Non-Inverting Octal Buffer/Line Drivers with 3-State Outputs 20-SOIC -55 to 125
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