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參數資料
型號: W921E843A
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-BIT MICROCONTROLLER
中文描述: 4-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP40
封裝: DIP-40
文件頁數: 16/58頁
文件大小: 449K
代理商: W921E843A
W921E840A/W921C840
- 16 -
The detail function of the system clock control register (SYSCCR) is shown as below:
SYSCCR register: (address = 000H, default data = 0H, only for W921E841A, 843A, 844A)
b3
b2
b1
b0
0:
1:
0:
1:
0:
1:
0:
1:
f = f
f = f
f enable
f disable
f enable
f disable
f = f
f = f
The W921E840A/W921C840 provides a crystal or RC oscillation circuit selected by bit0 of INI
register (refer to section 6.14) to generate the system clock through external connections. If a crystal
oscillator is used, a crystal or ceramic resonator must be connected to OSCI and OSCO, and the
capacitor is added optionally. The oscillator configuration is shown as follows.
OSCI
OSCO
or
OSCI
OSCO
RC type
Crystal Type
6.4 Initial State
The W921E840A/W921C840 is reset either by a power-on reset or by using the external RESET pin.
The initial state of the W921E840A/W921C840 after the reset function is executed is described
below. The EVF interrupt request signal register value is random, so user must do CLR EVF,
#11111111b instruction to clear all interrupt request signals after power-on reset.
Program counter (PC)
Stack pointer
Special function registers
TM0, TM1, TM2, TM3 input clock
TM0, TM1, TM2, TM3 contents
Input/Output
PM registers
DTMF output
EVF interrupt request signal register
0000H
0FFH
Refer to section 6.2.1
Fosc/8
0FFH
Input mode
1111B
Disable (H-Z)
Random
相關PDF資料
PDF描述
W921C880 4-Bit Microcontroller(4位微控制器)
W921E880A 4-Bit Microcontroller(4位微控制器)
W921E840 4-Bit Microcontroller(4位的微控制器)
W921E880 4-Bit Microcontroller(4位的微控制器)
W921F840 4-Bit Microcontroller(4位的微控制器)
相關代理商/技術參數
參數描述
W921E880 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER
W921E880A 制造商:WINBOND 制造商全稱:Winbond 功能描述:4-BIT MICROCONTROLLER
W925C240 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Controller
W925C625 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-bit CID MICROCONTROLLER
W925E240 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Controller