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| 型號(hào)： | PCD3755FT |
| 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, 8 kbytes OTP and 128 bytes EEPROM |
| 中文描述： | 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | 7.50 MM, PLASTIC, SO-28 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 200K |
| 代理商： | PCD3755FT |
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1997 Apr 16
18
Philips Semiconductors
Product specification
8-bit microcontrollers with DTMF generator,
8 kbytes OTP and 128 bytes EEPROM
PCD3755A; PCD3755E;
PCD3755F
8
DERIVATIVE INTERRUPTS
One derivative interrupt event is defined. It is controlled by
bits T2F and ET2I in the EPCR (see Tables 10 and 11).
The derivative interrupt event occurs when T2F is set. This
request is honoured under the following circumstances:
No interrupt routine proceeds
No external interrupt request is pending
The derivative interrupt is enabled
ET2I is set.
The derivative interrupt routine must include instructions
that will remove the cause of the derivative interrupt by
explicitly clearing T2F. If the derivative interrupt is not
used, T2F may directly be tested by the program.
Obviously, T2F can also be asserted under program
control, e.g. to generate a software interrupt.
9
TIMING
Although thePCD3755A, PCD3755E and PCD3755F
operate over a clock frequency range from 1 to 16 MHz,
f
xtal
= 3.58 MHz will usually be chosen to take full
advantage of the frequency generator section.
10 RESET
In addition to the conditions given in the “PCD33xxA
Family”data sheet, all derivative registers are cleared in
the reset state.
11 IDLE MODE
In Idle mode, the frequency generator, the EEPROM and
the Timer 2 sections remain operative. Therefore, the
IDLE instruction may be executed while an erase and/or
write access to EEPROM is in progress.
12 STOP MODE
Since the oscillator is switched off, the frequency
generator, the EEPROM and the Timer 2 sections receive
no clock. It is suggested to clear both the HGF and the
LGF registers before entering Stop mode. This will cut off
the biasing of the internal amplifiers, considerably
reducing current requirements.
The Stop mode
must not
be entered while an erase
and/or write access to EEPROM is in progress. The STOP
instruction may only be executed when EWP in EPCR is
zero. The Timer 2 section is frozen during Stop mode.
After exit from Stop mode by a HIGH level on CE/T0,
Timer 2 proceeds from the held state.
13 INSTRUCTION SET RESTRICTIONS
As RAM space is restricted to 128 bytes, care should be
taken to avoid accesses to non-existing RAM locations.
14 OVERVIEW OF PORT AND POWER-ON-RESET CONFIGURATION
Table 24
Port and Power-on-reset configuration
See note 1 and 2.
Notes
1.
2.
3.
Port output drive: 1 = standard I/O; 2 = open-drain I/O, see “PCD33xxA Family”data sheet.
Port state after reset: S = Set (HIGH) and R = Reset (LOW).
The Melody Output drive type is push-pull.
TYPE
PORT 0
PORT 1
PORT 2
V
POR
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
PCD3755A
PCD3755E
PCD3755F
1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1R 1R
(3)
1S 1S 1S 1S 1S 1S 1S 1S 2S 2S 2S 2S 2S 2S 1S 1S
(3)
1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1S 1R 1R
(3)
2S
2S
2S
2S
1R
2S
2S
1R
2S
2S
1R
2S
1.3 V
2.0 V
2.0 V
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