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| 型号： | SAA5491H/NNN |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, SOT-318-2, QFP-80 |
| 文件页数： | 3/72页 |
| 文件大小： | 498K |
| 代理商： | SAA5491H/NNN |
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1998 Dec 14
11
Philips Semiconductors
Preliminary specication
Economy teletext and TV microcontrollers
SAA5x9x family
7
FUNCTIONAL DESCRIPTION
7.1
Microcontroller
The functionality of the microcontroller used in this family
is described here with reference to the industry-standard
80C51 microcontroller. A full description of its functionality
can be found in the
“80C51-Based 8-Bit Microcontrollers;
Data Handbook IC20”. Using the 80C51 as a reference,
the changes made to this family fall into two categories:
Features not supported by the SAA529x, SAA529xA or
SAA549x devices
Features found on the SAA529x, SAA529xA or
SAA549x devices but not supported by the 80C51.
7.2
80C51 features not supported
7.2.1
INTERRUPT PRIORITY
The IP SFR is not implemented and all interrupts are
treated with the same priority level. The normal
prioritisation of interrupts is maintained within the level.
Table 2
Interrupts and vectors address
Note
1. SAA5290, SAA5290A, SAA5291, SAA5291A and
SAA5491 only.
7.2.2
OFF-CHIP MEMORY
The SDIP52 version does not support the use of off-chip
program memory or off-chip data memory.
7.2.3
IDLE AND POWER-DOWN MODES
As Idle and Power-down modes are not supported, their
respective bits in PCON are not available.
7.2.4
UART FUNCTION
The 80C51 UART is not available. As a consequence the
SCON and SBUF SFRs are removed and the ES bit in the
IE SFR is unavailable.
INTERRUPT SOURCE
VECTOR ADDRESS
Reset
000H
External INT0
003H
Timer 0
00BH
External INT1
013H
Timer 1
01BH
Byte I2C-bus
02BH
Bit I2C-bus; note 1
053H
7.3
Additional features
The following features are provided in addition to the
standard 80C51 features.
7.3.1
INTERRUPTS
The external INT1 interrupt is modified to generate an
interrupt on both the rising and falling edges of the INT1
pin, when EX1 bit is set. This facility allows for software
pulse width measurement for handling of a remote control.
7.3.2
BIT LEVEL I2C-BUS INTERFACE
For reasons of compatibility with SAA5290 and
SAA5290A, the SAA5291, SAA5291A and SAA5491
contain a bit level serial I/O which supports the I2C-bus.
P1.6/SCL and P1.7/SDA are the serial I/O pins. These two
pins meet the I2C-bus specification
“The I2C-bus and how
to use it (including specifications)” concerning the input
levels and output drive capability. Consequently, these two
pins have an open-drain output configuration. All the four
following modes of the I2C-bus are supported.
Master transmitter
Master receiver
Slave transmitter
Slave receiver.
Three SFRs support the function of the bit-level I2C-bus
hardware: S1INT, S1BIT and S1SCS and are enabled by
setting register bit TXT8.I2C SELECT to logic 0.
7.3.3
BYTE LEVEL I2C-BUS INTERFACE
The byte level serial I/O supports the I2C-bus protocol.
P1.6/SCL and P1.7/SDA are the serial I/O pins. These two
pins meet the I2C-bus specification concerning the input
levels and output drive capability. Consequently, these two
pins have an open-drain output configuration.
The byte level I2C-bus serial port is identical to the I2C-bus
serial port on the 8xC552. The operation of the subsystem
is described in detail in the 8xC552 data sheet found in
“80C51-Based 8-Bit Microcontrollers; Data Handbook
IC20”.
Four SFRs support the function of the byte level I2C-bus
hardware, they are S1CON, S1STA, S1DAT and S1ADR
and are enabled by setting register bit TXT8.I2C SELECT
to logic 1.
7.3.4
LED SUPPORT
Port pins P0.5 and P0.6 have a 10 mA current sinking
capability to enable LEDs to be driven directly.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SAA5491PS | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5496 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5496H | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5496PS | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
| SAA5497 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Economy teletext and TV microcontrollers |
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