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CHAPTER 14 PWM TIMER
14.3 Control Status Register (PCNH, PCNL)
The control status register (PCNH, PCNL) is used to control the PWM timer or indicate
the timer status. Note that the register has a bit that cannot be rewritten during PWM
timer operation.
■
Configuration of Control Status Registers (PCNH, PCNL)
The configuration of the control status register (PCNH, PCNL) is shown below:
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Bit Functions of Control Status Registers (PCNH, PCNL)
[bit 15] CNTE: Timer enable bit
This bit enables or disables the 16-bit decrementing counter.
[bit 14] STGR: Software trigger bit
Setting this bit to "1" enables a software trigger.
A read instruction always reads "0" from this bit.
[bit 13] MDSE: Mode select bit
This bit selects PWM operation that outputs continuous pulses or one-shot operation that
outputs a single pulse.
PCNH bit 15 14 13 12 11 10 9 8
Address: ch0 0000E6
H
ch1 0000EE
H
CNTE STGR MDSE RTRG CKS1 CKS0 PGMS
ch2 0000F6
H
ch3 0000FE
H
R/W R/W R/W R/W R/W R/W R/W
0000000
PCNL bit
76543210
Address: ch0 0000E7
H
ch1 0000EF
H
EGS1 EGS0 IREN IRQF IRS1 IRS0 POEN OSEL
ch2 0000F7
H
ch3 0000FF
H
R/W R/W R/W R/W R/W R/W R/W R/W
00000000
Attribute
Attribute
Initial value
Initial value
Rewriting enabled/disabled
during operation
Rewriting enabled/disabled
during operation
0 Disable (Initial value)
1 Enable
0 PWM operation (Initial value)
1 One-shot operation