参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 89/148页
文件大小: 1733K
代理商: PC87393F-VJG
2.0 Device Architecture and Configuration (Continued)
45
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2.10.10 SuperI/O Configuration 9 Register (SIOCF9)
Location:
Index 29h
Type:
Varies per bit
Bit
76
5
43210
Name
Reserved
Module
Enable
Status
Valid Multi-
plier Clock
Status
Clock
Enable
SuperI/O Chip Clock
Source
Reset
0
00010
Bit
Description
7-5
Reserved
4
Module Enable Status. This bit defines the status of all the PC8739x modules with exception of the X-Bus. This
bit is read only.
0: All modules disabled
1: At least one module enabled
3
Valid Multiplier Clock Status. This bit is read only.
0: On-chip clock frozen
1: On-chip clock stable and toggling
2
Clock Enable. This bit enables the 48 and 24 MHz clock to the SuperI/O modules. When the SuperI/O chip
clock source is set to 48 MHz, this bit enables the path from the input CLKIN pin. When the clock source is set
to 32.768 KHz or 14.31818 MHz, this bit enables the clock multiplier.This is a read/write bit that is reset by
hardware reset only.
0: Clock disabled (default)
1: Clock enabled
1-0
SuperI/O Chip Clock Source. These bits define the clock source for the SuperI/O chip that is fed via the CLKIN
pin. On power-up (only), these bits are read or write and assume their default value. Once they are written, they
become read only bits.
Bits
Function
1 0
0 0
Clock source is 48 MHz
0 1
Clock source is the on-chip clock multiplier fed by 32.768 KHz
1 0
Clock source is the on-chip clock multiplier fed by 14.31818 MHz (default)
1 1
Reserved
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