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參數資料
型號: W921E880A
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-Bit Microcontroller(4位微控制器)
中文描述: 4-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 39/57頁
文件大小: 372K
代理商: W921E880A
W921E880A/W921C880
Publication Release Date: September 1998
- 39 -
Revision A2
6.14 Initial Condition Register of EPROM Program Method
There is one 4-bit of the initial condition register (not part of the RAM) in W921E880A to control the
micro-controller initial status after power-on. The format is described as following:
INI register: (initial value = 0FH)
b3
b2
b1
b0
0: osc acts as RC oscillator type
1: osc acts as crystal type
Reserved
Reserved
0: f1 = f , f2 = f
H
L
1: f1 = f , f2 = f
L
6.15 Reset
1. Reset by
RESET
256 machine
cycle
Reset all
control reg.
Program executed from
address 000H
RESET
As RESET pin is pulled low, system and all control registers are reset to initial state. After RESET
pin is in high level, system will delay 256 machine cycle time then program is executed from address
000H.
2. Reset by Watch Dog Timer
Reset all control
regs except
STTM0.1.
256 machine
cycle
STTM0.1
Program executed from
address 000H
As watch dog timer underflows, the STTM0.1 is set, in the mean while, system and all control
registers, except data 1 in STTM0.1 bit is reserved, are reset to initial state then after a delay of 256
machine cycle time program is executed from address 000H. After system reset, user can detect
STTM0.1 to recognize which method of reset was done before.
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