P87C591VFA/00,512 NXP Semiconductors, P87C591VFA/00,512 Datasheet - Page 60

• Manufacturer Part Number: P87C591VFA/00,512
• Description: IC 80C51 MCU 16K OTP 44-PLCC
• Manufacturer: NXP Semiconductors
• Series: 87Cr

Specifications of P87C591VFA/00,512

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: CAN, EBI/EMI, I²C, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Processor Series: P87C5x
• Core: 80C51
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: CAN, I2C, UART
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 6 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 568-1256-5; 935268182512; P87C591VFAA

Philips Semiconductors
13 SERIAL I/O
The P8xC591 is equipped with three independent serial
ports: CAN, SIO0 and SIO1. SIO0 is a Standard Serial
Interface UART with enhanced functionality. In following
there will be one Section describing the Standard UART
functionality and an extra Section for Enhanced UART.
SIO1 accommodates the I
14 SIO0 STANDARD SERIAL INTERFACE UART
The serial port is full duplex, meaning it can transmit and
receive simultaneously. It is also receive-buffered,
meaning it can commence reception of a second byte
before a previously received byte has been read from the
register. (However, if the first byte still hasn’t been read by
the time reception of the second byte is complete, one of
the bytes will be lost.) The serial port receive and transmit
registers are both accessed at Special Function Register
transmit registers are both accessed at Special Function
Register S0BUF. Writing to S0BUF loads the transmit
register, and reading S0BUF accesses a physically
separate receive register.
The serial port can operate in 4 modes (one synchronous
mode, three asynchronous modes). The baud rate clock
for the serial port is derived from the oscillator frequency
(mode 0, 2) or generated either by timer 1 or by dedicated
baud rate generator (mode 1, 3).
Mode 0 Shift Register (Synchronous) Mode:
Mode 1 8-bit UART, Variable Baud Rate:
Mode 2 9-bit UART, Fixed Baud Rate:
2000 Jul 26
Single-chip 8-bit microcontroller with CAN controller
Serial data enters and exits through RxD. TxD
outputs the shift clock. 8 bits are transmitted/
received (LSB first). The baud rate is fixed
oscillator frequency.
10 bits are transmitted (through TxD) or received
(through RxD): a start bit (0), 8 data bits (LSB
first), and a stop bit (1). On receive, the stop bit
goes into RB8 in Special Function Register
SCON. The baud rate is variable.
11 bits are transmitted (through TxD) or received
(through RxD): start bit (0), 8 data bits (LSB first),
a programmable 9
On Transmit, the 9
be assigned the value of 0 or 1. Or, for example,
the parity bit (P, in the PSW) could be moved into
TB8. On receive, the 9
Special Function Register SCON, while the stop
bit ignored. The baud rate is programmable to
either
1
16
or
1
32
the oscillator frequency.
2
C bus.
th
th
data bit, and a stop bit (1).
data bit (TB8 in SCON) can
th
data bit goes into RB8 in
1
6
the
60
Mode 3 9-bit UART, Variable Baud Rate:
In all four modes, transmission is initiated by any
instruction that uses S0BUF as a destination register.
Reception is initiated in Mode 0 by the condition RI = 0 and
REN = 1. Reception is initiated in the other modes by the
incoming start bit if REN = 1.
14.1
Modes 2 and 3 have a special provision for multiprocessor
communications. In these modes, 9 data bits are received.
The 9
port can be programmed such that when the stop bit is
received, the serial port interrupt will be activated only if
RB8 = 1. This feature is enabled by setting bit SM2 in
SCON. A way to use this feature in multiprocessor
systems is as follows:
When the master processor wants to transmit a block of
data to one of several slaves, it first send out an address
byte which indentifies the target slave. An address byte
differs from a data byte in that the 9
byte and 0 in a data byte. With SM2 = 1, no slave will be
interrupted by a data byte. An address byte, however, will
interrupt all slaves, so that each slave can examine the
received byte and see if it is being addressed. The
addressed slave will clear its SM2 bit and prepare to
receive the data bytes that will be coming. The slaves that
weren’t being addressed leave their SM2s set and go on
about their business, ignoring the coming data bytes.
SM2 has no effect in Mode 0, and in Mode 1 can be used
to check the validity of the stop bit. In a Mode 1 reception,
if SM2 = 1, the receive interrupt will not be activated unless
a valid stop bit is received.
14.2
The serial port control and status register is the Special
Function Register SCON, shown in Table 38, 40 and 41.
This register contains not only the mode selection bits, but
also the 9
RB8), and the serial port interrupt bits (TI and RI).
S0BUF is the receive and transmit buffer of serial
interface. Writing to S0BUF loads the transmit register and
initiates transmission. Reading out S0BUF accesses a
physically separate receive register.
th
Multiprocessor Communications
Serial Port Control Register
one goes into RB8. Then comes a stop bit. The
11 bits are transmitted (through TxD) or received
(through RxD): start bit (0), 8 data bits (LSB first),
a programmable 9
fact, Mode 3 is the same as Mode 2 in all respects
except baud rate. The baud rate in Mode 3 is
variable.
th
data bit for transmit and receive (TB8 and
th
data bit, and a stop bit (1). In
Preliminary Specification
th
bit is 1 in an address
P8xC591