參數(shù)資料
型號： PIC16CR73
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 70/172頁
文件大?。?/td> 1506K
代理商： PIC16CR73
PIC16CR7X
DS21993C-page 68
2007 Microchip Technology Inc.
9.3.2
MASTER MODE
Master mode of operation is supported in firmware
using interrupt generation on the detection of the Start
and Stop conditions. The Stop (P) and Start (S) bits are
cleared from a Reset or when the SSP module is dis-
abled. The Stop (P) and Start (S) bits will toggle based
on the Start and Stop conditions. Control of the I
2
C bus
may be taken when the P bit is set, or the bus is Idle
and both the S and P bits are clear.
In Master mode, the SCL and SDA lines are manipu-
lated by clearing the corresponding TRISC<4:3> bit(s).
The output level is always low, irrespective of the
value(s) in PORTC<4:3>. So when transmitting data, a
‘
1
’ data bit must have the TRISC<4> bit set (input) and
a ‘
0
’ data bit must have the TRISC<4> bit cleared (out-
put). The same scenario is true for the SCL line with the
TRISC<3> bit. Pull-up resistors must be provided
externally to the SCL and SDA pins for proper
operation of the I
2
C module.
The following events will cause SSP Interrupt Flag bit,
SSPIF, to be set (SSP Interrupt will occur if enabled):
Start condition
Stop condition
Data transfer byte transmitted/received
Master mode of operation can be done with either the
Slave mode Idle (SSPM3:SSPM0 =
1011
), or with the
Slave active. When both Master and Slave modes are
enabled, the software needs to differentiate the
source(s) of the interrupt.
9.3.3
MULTI-MASTER MODE
In Multi-Master mode, the interrupt generation on the
detection of the Start and Stop conditions, allows the
determination of when the bus is free. The Stop (P) and
Start (S) bits are cleared from a Reset or when the SSP
module is disabled. The Stop (P) and Start (S) bits will
toggle based on the Start and Stop conditions. Control
of the I
2
C bus may be taken when bit P (SSPSTAT<4>)
is set, or the bus is Idle and both the S and P bits clear.
When the bus is busy, enabling the SSP Interrupt will
generate the interrupt when the Stop condition occurs.
In Multi-Master operation, the SDA line must be moni-
tored to see if the signal level is the expected output
level. This check only needs to be done when a high
level is output. If a high level is expected and a low level
is present, the device needs to release the SDA and
SCL lines (set TRISC<4:3>). There are two stages
where this arbitration can be lost, these are:
Address Transfer
Data Transfer
When the slave logic is enabled, the slave continues to
receive. If arbitration was lost during the address trans-
fer stage, communication to the device may be in
progress. If addressed, an ACK pulse will be gener-
ated. If arbitration was lost during the data transfer
stage, the device will need to retransfer the data at a
later time.
TABLE 9-3:
REGISTERS ASSOCIATED WITH I
2
C OPERATION
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR,
BOR
Value on
all other
Resets
0Bh, 8Bh,
10Bh,18Bh
INTCON
GIE
PEIE
TMR0IE
INTE
RBIE
TMR0IF
INTF
RBIF
0000 000x
0000 000u
0Ch
PIR1
PSPIF
(1)
ADIF
RCIF
TXIF
SSPIF CCP1IF TMR2IF TMR1IF
0000 0000
0000 0000
8Ch
PIE1
PSPIE
(1)
ADIE
RCIE
TXIE
SSPIE CCP1IE TMR2IE TMR1IE
0000 0000
0000 0000
13h
SSPBUF
Synchronous Serial Port Receive Buffer/Transmit Register
xxxx xxxx
uuuu uuuu
93h
SSPADD Synchronous Serial Port (I
2
C mode) Address Register
0000 0000
0000 0000
14h
SSPCON
WCOL
SSPOV SSPEN
CKP
SSPM3 SSPM2 SSPM1 SSPM0
0000 0000
0000 0000
94h
SSPSTAT
SMP
(2)
CKE
(2)
D/A
P
S
R/W
UA
BF
0000 0000
0000 0000
87h
TRISC
PORTC Data Direction Register
1111 1111
1111 1111
Legend:
x
= unknown,
u
= unchanged, – = unimplemented locations read as ‘
0
’. Shaded cells are not used by SSP module in
I
2
C mode.
PSPIF and PSPIE are reserved on the PIC16CR73/76; always maintain these bits clear.
Maintain these bits clear in I
2
C mode.
Note
1:
2:
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