參數(shù)資料
型號： P83C591VFA
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Single-chip 8-bit microcontroller with CAN controller
中文描述： 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, MO-047AC, SOT-187-2, LCC-44
文件頁數(shù)： 77/161頁
文件大小： 588K
代理商： P83C591VFA
1999 Aug 19
77
Philips Semiconductors
Objective Specification
Single-chip 8-bit microcontroller with CAN controller
P8xC591
15.2
SIO1 Implementation and Operation
Figure 32 shows how the on-chip I
2
C bus interface is
implemented, and the following text describes the
individual blocks.
15.2.1
I
NPUT
F
ILTERS AND
O
UTPUT
S
TAGES
The input filters have I
2
C compatible input levels. If the
input voltage is less than 1.5 V, the input logic level is
interpreted as 0; if the input voltage is greater than 3.0 V,
the input logic level is interpreted as 1. Input signals are
synchronized with the internal clock (f
CLK
/4), and spikes
shorter than three oscillator periods are filtered out.
The output stages consist of open drain transistors that
can sink 3 mA at V
OUT
< 0.4 V. These open drain outputs
do have clamping diodes to V
DD
. Thus, precautions have
to be considered, if a powered-down 8xC591 on one board
clamps the I
2
C bus externally.
15.2.2
A
DDRESS
R
EGISTER
, S1ADR
This 8-bit special function register may be loaded with the
7-bit slave address (7 most significant bits) to which SIO1
will respond when programmed as a slave transmitter or
receiver. The LSB (GC) is used to enable general call
address (00H) recognition.
15.2.3
C
OMPARATOR
The comparator compares the received 7-bit slave
address with its own slave address (7 most significant bits
in S1ADR). It also compares the first received 8-bit byte
with the general call address (00H). If an equality is found,
the appropriate status bits are set and an interrupt is
requested.
15.2.4
S
HIFT
R
EGISTER
, S1DAT
This 8-bit special function register contains a byte of serial
data to be transmitted or a byte which has just been
received. Data in S1DAT is always shifted from right to left;
the first bit to be transmitted is the MSB (bit 7) and, after a
byte has been received, the first bit of received data is
located at the MSB of S1DAT. While data is being shifted
out, data on the bus is simultaneously being shifted in;
S1DAT always contains the last byte present on the bus.
Thus, in the event of lost arbitration, the transition from
master transmitter to slave receiver is made with the
correct data in S1DAT.
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P83C591VFB 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single-chip 8-bit microcontroller with CAN controller
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