PIT::Control Union Reference

Public Member Functions
	Control (uint8_t value)
	Constructor.
	Control ()
	Default constructor Automatically reads the current contents from the control register.
void	write () const
	Write the current state to the control register.

Public Attributes
struct {
uint8_t	enable_timer_counter2: 1
	If enabled, the interrupt state will be visible at status_timer_counter2.
uint8_t	enable_speaker_data: 1
	If set, speaker output is equal to status_timer_counter2.
uint8_t	enable_pci_serr: 1
	not important, do not modify
uint8_t	enable_nmi_iochk: 1
	not important, do not modify
uint8_t	refresh_cycle_toggle: 1
	not important, must be 0 on write
uint8_t	status_timer_counter2: 1
	will be set on timer expiration; must be 0 on write
uint8_t	status_iochk_nmi_source: 1
	not important, must be 0 on write
uint8_t	status_serr_nmi_source: 1
	not important, must be 0 on write
};
	I/O-port bitmap for the NMI Status and Control Register.
uint8_t	value

Constructor & Destructor Documentation

Control() [1/2]

PIT::Control::Control ( uint8_t value )

inlineexplicit

Constructor.

Parameters

value

Numeric value for the control register

Control() [2/2]

PIT::Control::Control ( )

inline

Default constructor Automatically reads the current contents from the control register.

Member Function Documentation

write()

void PIT::Control::write ( ) const

inline

Write the current state to the control register.

Member Data Documentation

[struct]

struct { ... } PIT::Control

I/O-port bitmap for the NMI Status and Control Register.

Note

Over time, the meaning of the bits stored at I/O port 0x61 changed; don't get the structure confused with old documentation on the IBM PC XT platform.

See also

Intel® I/O Controller Hub 7 (ICH7) Family, page 415

value

uint8_t PIT::Control::value

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The documentation for this union was generated from the following file:

• machine/pit.cc