CS5530A datasheet(168/259 Pages) NSC

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Revision 1.1

Index 89h

General Purpose Timer 1 Control Register (R/W)

Reset Value = 00h

Timebase for General Purpose Timer 1: Selects timebase for GP Timer 1 (F0 Index 88h). 0 = 1 sec; 1 = 1 msec.

Re-trigger General Purpose Timer 1 on User Defined Device 3 (UDEF3) Activity: 0 = Disable; 1 = Enable.

Any access to the configured (memory or I/O) address range for UDEF3 reloads GP Timer 1. UDEF3 address

programming is at F0 Index C8h (base address register) and CEh (control register).

Re-trigger General Purpose Timer 1 on User Defined Device 2 (UDEF2) Activity: 0 = Disable; 1 = Enable.

Any access to the configured (memory or I/O) address range for UDEF2 reloads GP Timer 1. UDEF2 address

programming is at F0 Index C4h (base address register) and CDh (control register).

Re-trigger General Purpose Timer 1 on User Defined Device 1 (UDEF1) Activity: 0 = Disable; 1 = Enable.

Any access to the configured (memory or I/O) address range for UDEF1 reloads GP Timer 1. UDEF1 address

programming is at F0 Index C0h (base address register) and CCh (control register)

Re-trigger General Purpose Timer 1 on Keyboard or Mouse Activity: 0 = Disable; 1 = Enable

Any access to the keyboard or mouse I/O address range (listed below) reloads GP Timer 1.

Keyboard Controller: I/O Ports 060h/064h

COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is included)

COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is included)

Re-trigger General Purpose Timer 1 on Parallel/Serial Port Activity: 0 = Disable; 1 = Enable.

Any access to the parallel or serial port I/O address range (listed below) reloads the GP Timer 1.

LPT1: I/O Port 378h-37Fh, 778h-77Ah

LPT2: I/O Port 278h-27Fh, 678h-67Ah

COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded)

COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded)

COM3: I/O Port 3E8h-3EFh

COM4: I/O Port 2E8h-2EFh

Re-trigger General Purpose Timer 1 on Floppy Disk Activity: 0 = Disable; 1 = Enable.

Any access to the floppy disk drive address ranges (listed below) reloads GP Timer 1.

Primary floppy disk: I/O Port 3F2h, 3F4h, 3F5h, and 3F7

Secondary floppy disk: I/O Port 372h, 373h, 375h, and 377h

The active floppy drive is configured via F0 Index 93h[7].

Re-trigger General Purpose Timer 1 on Primary Hard Disk Activity: 0 = Disable; 1 = Enable.

Any access to the primary hard disk drive address range selected in F0 Index 93h[5] reloads GP Timer 1.

Index 8Ah

General Purpose Timer 2 Count Register (R/W)

Reset Value = 00h

7:0

General Purpose Timer 2 Count: This register holds the load value for GP Timer 2. This value can represent either an 8-

bit or 16-bit timer (configured in F0 Index 8Bh[5]). It is loaded into the timer when the timer is enabled (F0 Index 83h[1] = 1).

Once the timer is enabled and a transition occurs on GPIO7, the timer is re-loaded.

The timer is decremented with each clock of the configured timebase. Upon expiration of the timer, an SMI is generated and

the top level of status is F1BAR+Memory Offset 00h/02h[9] and the second level of status is reported in F1BAR+Memory

Offset 04h/06h[1]).

Once expired, this timer must be re-initialized by either disabling and enabling it, or writing a new count value here.

For GPIO7 to act as the reload for this timer, it must be enabled as such (F0 Index 8Bh[2]) and be configured as an input (F0

Index 90h[7]).

This timer’s timebase can be configured as 1 msec or 1 sec in F0 Index 8Bh[3].

Table 4-15. F0 Index xxh: PCI Header and Bridge Configuration Registers (Continued)

Bit

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CS5530A Datasheet(PDF) 168 Page - National Semiconductor (TI)

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