參數(shù)資料
型號： PCA5010H
廠商： NXP Semiconductors N.V.
英文描述： Pager baseband controller
中文描述： 傳呼機基帶控制器
文件頁數(shù)： 25/112頁
文件大小： 627K
代理商： PCA5010H
1998 Nov 02
25
Philips Semiconductors
Product specification
Pager baseband controller
PCA5010
Table 15
Symbols used in Tables 12 to 14
SYMBOL
DESCRIPTION
SLA
R
W
ACK
ACK
DATA
MST
SLV
TRX
REC
7-bit slave address
read bit
write bit
acknowledgement (acknowledge bit = logic 0)
no acknowledgement (acknowledge bit = logic 1)
8-bit data byte to or from I
2
C-bus
master
slave
transmitter
receiver
6.9
Serial interface SIO0: UART
The UART interface of the PCA5010 implements a subset
of the complete standard as defined in e.g. the P80CL580.
6.9.1
D
IFFERENCES TO THE STANDARD
80C51 UART
The following deviations from the standard exist:
If [SM1 and SM0] = 10 then Mode 1 (8-bit data
transmission) is selected, with a fixed baud rate
(4800/9600 bits/s)
If [SM1 and SM0] = 01 then Mode 2 (9-bit data
transmission) is selected, with a fixed baud rate
(4800/9600 bits/s)
Modes 0 and 3 and the variable baud rate selection
using Timer 1 overflow is not available
The SM2 bit has no function
The time reference for modes 1 and 2 is taken from the
76.8 kHz oscillator, instead of the original
6.9.2
UART
MODES
This serial port is full duplex which means that it can
transmit and receive simultaneously. It is also
receive-buffered and can commence reception of a
second byte before a previously received byte has been
read from the register. However, if the first byte has not
been read by the time the reception of the second byte is
complete, the second byte will be lost. The serial port
receive and transmit registers are both accessed via the
special function register S0BUF. Writing to S0BUF loads
the transmit register and reading S0BUF accesses a
physically separate receive register.
f
-12
The serial port can operate in 2 modes:
Mode 1 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 S0CON
(see Figs 11 and 12).
Mode 2 11 bits are transmitted (through TXD) or received
(through RXD): a start bit (0), 8 data bits (LSB
first), a programmable 9th data bit and a STOP
bit (1). On transmit, the 9th data bit (TB8 in
S0CON) can 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 9th
data bit goes into RB8 in S0CON, while the STOP
bit is ignored (see Figs 11 and 13).
In both modes the baud rate can be selected to either
4800 or 9600 depending on the SMOD bit in the PCON
SFR. If SMOD = 0 the baud rate is 4800, if SMOD = 1 the
baud rate is 9600 with a 76.8 kHz quartz.
In both modes, transmission is initiated by any instruction
that uses S0BUF as a destination register. Reception is
initiated by the incoming start bit if REN = 1.
6.9.3
S
ERIAL
P
ORT
C
ONTROL
R
EGISTER
(S0CON)
The serial port control and status register is the special
function register S0CON (see Table 16). The register
contains not only the mode selection bits, but also the 9th
data bit for transmit and receive (TB8 and RB8), and the
serial port interrupt bits (TI and RI).
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