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參數資料
| 型號： | W53342 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 60" Voice/Melody/LCD Controller(60”話音/音樂/LCD控制器) |
| 中文描述： | 4-BIT, MROM, MICROCONTROLLER |
| 文件頁數： | 12/65頁 |
| 文件大小： | 719K |
| 代理商： | W53342 |
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W53322/W53342
- 12 -
X
CF
0
1
2
3
X
CF
X
Clock Generator
The W533X2 provides two oscillation circuits- main-oscillator (FM) and sub-oscillator (FS). The SCR (System Control
Register) uses to select clock operation condition. Either main-oscillator or sub-clock can be the system clock ( FOSC )
by F32IN option bit (bit 0 of SCR special register) . The main-oscillator starts oscillation if FMEN (bit 1 of SCR) is written
to 1. Main-oscillator can select crystal or RC oscillation by special register FMRCB bit (bit 2 of SCR) through external
connections. If a crystal oscillator is used, a crystal or a ceramic resonator must be connected between XIN and XOUT,
and a capacitor must be connected if an accurate frequency is needed. The oscillator is range form 400 KHz to 4 MHz. A
455 KHz ceramic resonator can be selected if a IR carrier output from RE3/TONE is needed. If the RC oscillator is used, a
resistor must be connected between XIN and VDD. The sub-oscillator must be connected to a 32.768 KHz crystal
between X32I and X32O. The connection is shown in Figure 3. One machine cycle consists of a four-state system clock
sequence and can run up to 1
μ
S with a 4 MHz system clock.
XIN
XOUT
X32I
X32O
or
(400K to 4MHz )
Crystal
Crystal
32 KHz
RXIN
VDD
Figure 3. Oscillator Configuration
Dual-clock operation
This operation mode is dual-clock mode while FMEN bit is enable, and LCD operation clock source should be the sub-
oscillator clock (32768 Hz) only. Sub-clock is used as system clock in initial reset such power on or reset pin active
because SCR special register is 0001B. Programmer firstly needs to write F32IN suitable value at program start to change
system clock to main--clock if high frequency clock is needed.
The exchange of the main-clock and sub-clock operation is performed by resetting or setting F32IN. If he F32IN is reset to
0, the clock source of the system clock generator is the main-oscillator clock; if the F32IN is set to 1, the clock source of
the system clock generator is the sub-oscillator clock. The main-oscillator can stop oscillating when FMEN is reset to 0.
When the SCR is set or reset, we must pay attention to the following:
1. XX10B
→
XX01B: Disable the main-oscillator (F
M
) should not be done simultaneously with changing the system clock
source(F
OSC
) from F
M
to F
S
. The F
OSC
should be changed first from F
M
to F
S
before the main-oscillator (F
M
) is
disable. The correct seqence is: XX10B
→
XX11B
→
XX01B.
2. XX01B
→
XX10B: Enabling the main-oscillator (F
M
) should not be done simultaneously with changing from F
S
into F
M
.
The main-oscillator (F
M
) should be enabled first before a delay subroutine is called to allow the main-oscillator to oscillate
stably. The F
OSC
can now be changed from F
S
into F
M
. The correct sequence is therefore XX01B
→
XX11B
→
delay
subroutine
→
XX10B. The suggested delay for Fm is 3.5 mS for 455 KHz ceramic resonator and 0.8 mS for 4 MHz crystal.
We must remember that the XX00B state which F
M
is stopped and F
OSC
is come from F
M
is inhibitive, because it will
induce a system shutdown. The organization of the dual-clock operation mode is shown in below.
相關PDF資料 |
PDF描述 |
|---|---|
| W53322 | 60" Voice/Melody/LCD Controller(60”話音/音樂/LCD控制器) |
| W536030A | VOICE/ MELODY / LCD CONTROLLER |
| W536060A | VOICE/ MELODY / LCD CONTROLLER |
| W536090A | VOICE/ MELODY / LCD CONTROLLER |
| W536030P | VOICE & MELODY CONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W5339 | 制造商:Tamura Corporation of America 功能描述: |
| W53481132SARC | 制造商:Winslow Adaptics Ltd 功能描述:32 way 1 row through board socket,1.27mm |
| W53482120SARC | 制造商:Winslow Adaptics Ltd 功能描述:20 way 2 row through board socket,1.27mm |
| W53482140SARC | 制造商:Winslow Adaptics Ltd 功能描述:40 way 2 row through board socket,1.27mm |
| W53482180SARC | 制造商:Winslow Adaptics Ltd 功能描述:80 way 2 row through board socket,1.27mm |
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