mc146818.h
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上传用户:luoyougen
上传日期:2008-05-12
资源大小:23136k
文件大小:2k
源码类别:
VxWorks
开发平台:
C/C++
- /* mc146818.h - Motorolla ? 146818 RTC (Real Time Clock) */
- /* Copyright 1984-2001 Wind River Systems, Inc. */
- /*
- modification history
- --------------------
- 01c,13apr01,hdn added macros for status register A, B, C, D.
- 01b,09nov93,vin moved AUX_CLK_RATE_MIN and AUX_CLK_RATE_MAX macro definitions
- to config.h
- 01a,17aug93,hdn written.
- */
- #ifndef __INCmc146818h
- #define __INCmc146818h
- #ifdef __cplusplus
- extern "C" {
- #endif
- #ifndef _ASMLANGUAGE
- typedef struct
- {
- int rate;
- char bits;
- } CLK_RATE;
- #endif /* _ASMLANGUAGE */
- /* offset of status register A, B, C, D */
- #define MC146818_STATUS_A 0x0a /* Status Register A */
- #define MC146818_STATUS_B 0x0b /* Status Register B */
- #define MC146818_STATUS_C 0x0c /* Status Register C */
- #define MC146818_STATUS_D 0x0d /* Status Register D */
- /* bit values for status register A - RW except UIP */
- #define MC146818_UIP 0x80 /* Update In Progress */
- #define MC146818_DV_BITS 0x70 /* Divider Bits */
- #define MC146818_RS_BITS 0x0f /* Rate Selection Bits */
- /* bit values for status register B - RW */
- #define MC146818_SET 0x80 /* Set to 1 (abort update) */
- #define MC146818_PIE 0x40 /* Periodic Int Enable */
- #define MC146818_AIE 0x20 /* Alarm Int Enable */
- #define MC146818_UIE 0x10 /* Update-ended Int Enable */
- #define MC146818_SQWE 0x08 /* Square Wave Enable */
- #define MC146818_DM 0x04 /* Date Mode */
- #define MC146818_24 0x02 /* 1=24-hour 0=12-hour */
- #define MC146818_DSE 0x01 /* Daylight Saving Enable */
- /* bit values for status register C - R */
- #define MC146818_IRQF 0x80 /* Int Request Flag */
- #define MC146818_PF 0x40 /* Periodic Int Flag */
- #define MC146818_AF 0x20 /* Alarm Int Flag */
- #define MC146818_UF 0x10 /* Update-ended Int Flag */
- /* bit values for status register D - R */
- #define MC146818_VRT 0x80 /* Valid RAM and Time */
- #ifdef __cplusplus
- }
- #endif
- #endif /* __INCmc146818h */