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參數資料
| 型號： | PCA3354CH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit microcontrollers with DTMF generator and 256 bytes EEPROM |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 14 X 14 X 2.20 MM, PLASTIC, QFP-44 |
| 文件頁數： | 17/32頁 |
| 文件大小： | 221K |
| 代理商： | PCA3354CH |
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1996 Dec 18
17
Philips Semiconductors
Product specification
8-bit microcontrollers with DTMF
generator and 256 bytes EEPROM
PCA3354C; PCD3354A
7.5.5
E
RASE PAGE
The EEPROM flags are set as described in Section 7.5.1.
The corresponding page bytes are erased.
The last instruction also starts Timer 2. Erasure takes
5 ms. A single-byte erase is simply a special case of ‘erase
page’.
Note that ADDR does not auto-increment after an erase
cycle.
Table 22
Erase page
7.6
Timer 2
Timer 2 is a 8-bit down-counter decremented at a rate of
1
480
×
f
xtal
. It may be used either for EEPROM timing or as
a general purpose timer. Conflicts between the two
applications should be carefully avoided.
7.6.1
T
IMER
2
FOR
EEPROM
TIMING
When used for EEPROM timing, Timer 2 serves to
generate the 5 ms intervals needed for erasing or writing
the EEPROM. At the decrement rate of
1
480
×
f
xtal
, the
reload value for a 5 ms interval is a function of f
xtal
.
Table 23 summarizes the required reload values for a
number of oscillator frequencies.
Timer 2 is started by setting bit EWP in the EPCR.
The Timer Register T2 is loaded with the reload value from
RELR. T2 decrements to zero.
For an erase/write cycle, underflow of T2 indicates the end
of the erase operation. Therefore, Timer Register T2 is
reloaded from RELR for another 5 ms interval during
which the flagged EEPROM latches are copied to the
corresponding bytes in the page addressed by ADDR.
INSTRUCTION
RESULT
MOV A, #EWP + MC3 + MC2 + MC1 ‘erase page’
control word
start ‘erase
page’ cycle
MOV EPCR, A
The second underflow of an erase/write cycle and the first
underflow of write page and erase page conclude the
corresponding EEPROM cycle. Timer 2 is stopped, T2F is
set whereas EWP and MC1 to MC3 are cleared.
Table 23
Reload values as a function of f
xtal
Note
1.
The reload value is (5
×
10
3
×
1
480
×
f
xtal
)
1;
f
xtal
in MHz.
7.6.2
T
IMER
2
AS A GENERAL PURPOSE TIMER
When used for purposes other than EEPROM timing,
Timer 2 is started by setting STT2. The Timer 2 Register
T2 (see Table 25) is loaded with the reload value from
RELR. T2 decrements to zero. On underflow, T2 is
reloaded from RELR, T2F is set and T2 continues to
decrement.
Timer 2 can be stopped at any time by clearing STT2.
The value of T2 is then held and can be read out. After
setting STT2 again, Timer 2 decrements from the reload
value. Alternatively, it is possible to read T2 ‘on the fly’ i.e.
while Timer 2 is operating.
f
xtal
(MHz)
RELOAD VALUE
(1)
(HEX)
1
2
0A
14
25
3E
6F
A6
3.58
6
10.74
16
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相關代理商/技術參數 |
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|---|---|
| PCA36-0 | 制造商:Panduit Corp 功能描述:B-ID |
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| PCA-36-2 | 制造商:Panduit Corp 功能描述: |
| PCA36-2 | 制造商:Panduit Corp 功能描述: |
| PCA36-3 | 制造商:Panduit Corp 功能描述: |
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