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參數資料
型號: W88227F
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標準的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: PLASTIC, QFP-128
文件頁數: 25/116頁
文件大小: 787K
代理商: W88227F
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 21 -
1999/10/1 Rev: 0.70
2.2.2 Microcontroller Interface
2.2.2.1 Programmable System Clock
The internal system frequency is controlled by
CCTL1 (1Ah,w)
and
PSKCTL (59h,w)
. Register
PSKCTL (59h,w)
should be set before the programmable system clock is enabled by setting
PSKEN (1Ah.w4)
high. If both
PSKEN (1Ah.w4)
and
PSKSEL (59h.w7)
are high,
PSK5-0 (59h.5-0)
are used to controlled the internal system
frequency. Register
PSKCTL (59h,w)
should be set before the programmable system clock is enabled by setting
PSKEN (1Ah.w4)
high. The equation is:
frequency of system clock = frequency of ACLK
×
(PSK[5:0] + 2)
÷
16
The variation of the resultant system frequency is normally less than 5%.
<example> If the frequency of ACLK is 33.8688 MHz,
PSKEN (1Ah.w4)
and
PSKSEL (59h.w7)
are high:
PSK5-0
System Frequency
Remark
0Fh
11h
13h
15h
17h
19h
1Bh
36 MHz
40.2 MHz
44.4 MHz
48.7 MHz
53 MHz
57.2 MHz
61.4 MHz
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