參數(shù)資料
型號(hào)： MC33884DW
廠商： MOTOROLA INC
元件分類： 其它接口
英文描述： SWITCH MONITOR INTERFACE
中文描述： SPECIALTY INTERFACE CIRCUIT, PDSO24
封裝： SOIC-24
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 235K
代理商： MC33884DW
17
MOTOROLA TSG IC DEVICE DATA
DESCRIPTION (Continued)
Normal and Periodic
Bits [16:15] identify one of the three operating modes: Normal, Polling, and Polling + INT Timer. The remaining bits identify the
device as the Master or a Slave, whether the device has an interrupt that has not been cleared, and the state of all the inputs.
MSB
Bit
LSB
Bit
Mode
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Normal
0
1
MASL
INT
SG6
SG5
SG4
SG3
SG2
SG1
SP4
SP3
SP2
SP1
SB2
SB1
Polling
1
0
X
Polling + INT Timer
1
1
INT
MASL — Master/Slave Identification Flag
This flag is the same as the state of the MASL pin. It provides software identification of the configuration of each IC.
MASL Bit Definition
MASL
Device is a
0
Slave
1
Master
INT — External Interrupt Flag
This flag identifies this particular IC as the initiator of an external interrupt. It is the inverse of INTB.
INT Bit Definition
Mode
Bit 16
15
14
13
Type of Interrupt
Normal
0
1
X
0
Nothing has happened
1
Switch Interrupt
Polling
1
0
X
X
–
Polling + INT
Timer
1
1
X
0
Nothing has happened
1
Wake–Up Interrupt
SG[6:1] — Switch–to–Ground Flag
SB[2:1] — Switch–to–Battery Flag
SP[4:1] — Programmable Switch Flag
These twelve flags indicate the state of all switch inputs:
Switch State Bit Definition
SGx, SBx, SPx
External Switch is:
Mode
Input States Latched:
0
Open
Normal
At the moment CSB transitions to logic 0.
1
Closed
Polling
Tri–State
All Tri–State inputs have their wetting and sustain currents disabled. By definition, all disabled inputs return the following value
for the switch state whenever SPI data is exchanged:
Tri–State Bit Definition
SGx, SBx, SPx
External Switch is:
0
Tri–State
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