EM6621
6.4.4 PWM and Frequency Output
PB[3] can also be used to output the PWM (Pulse Width Modulation) signal from the 10-Bit Counter, the
Ck[16], Ck[11] as well as the Ck[1] prescaler frequencies.
-Selecting PWM output on PB[3] with bit
PWMOn
in register
RegPresc
and running the counter.
-Selecting Ck[16] output on PB[2] with bit
PB32kHzOut
in register
OPTFSelPB
-Selecting Ck[11] output on PB[1] with bit
PB1kHzOut
in register
OPTFSelPB
-Selecting Ck[1 ] output on PB[0] with bit
PB1HzOut
in register
OPTFSelPB
6.5 Port B Registers
Table 6.5.1 Register RegPBData
Bit
Name
Reset
R/W
3
PBData[3]
-
R*/W
2
PBData[2]
-
R*/W
1
PBData[1]
-
R*/W
0
PBData[0]
-
R*/W
* : Direct read on the port B terminal (not the internal register)
Table 6.5.2 Register RegPBCntl
Bit
Name
Reset
3
PBIOCntl[3]
0
2
PBIOCntl[2]
0
1
PBIOCntl[1]
0
0
PBIOCntl[0]
0
Default "0" is: port B in input mode
Table 6.5.3 Option Register OPTFSelPB
Bit
power on
R/W
Description
value
3
InpResSleep
0
R/W
Reset from sleep with port A
2
PB32kHzOut
0
R/W
Ck[16] output on PB[2]
1
PB1kHzOut
0
R/W
Ck[11] output on PB[1]
0
PB1HzOut
0
R/W
Ck[1] output on PB[0]
Default "0" is: No frequency output, port A Input Reset can not reset the SLEEP mode.
Name
R/W
R/W
R/W
R/W
R/W
Description
I/O control for PB[3]
I/O control for PB[2]
I/O control for PB[1]
I/O control for PB[0]
Description
PB[3] input and output
PB[2] input and output
PB[1] input and output
PB[0] input and output
Table 6.5.4 Option Register OPTNoPdPB
Bit
3
2
1
0
Name
power on
value
0
0
0
0
R/W
R/W
R/W
R/W
R/W
Description
No pull-down on PB[3]
No pull-down on PB[2]
No pull-down on PB[1]
No pull-down on PB[0]
NoPdPB[3]
NoPdPB[2]
NoPdPB[1]
NoPdPB[0]
Default "0" is: Pull-down on
Table 6.5.5 Option Register OPTNchOpDPB
Bit
3
2
1
0
Name
power on
value
0
0
0
0
R/W
R/W
R/W
R/W
R/W
Description
Nch. Open Drain on PB[3]
Nch. Open Drain on PB[2]
Nch. Open Drain on PB[1]
Nch. Open Drain on PB[0]
NchOpDPB[3]
NchOpDPB[2]
NchOpDPB[1]
NchOpDPB[0]
Default "0" is: CMOS output
03/02 REV. D/444
Copyright
2002, EM Microelectronic-Marin SA
19
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