參數(shù)資料
型號: W78IRD2A
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數(shù): 58/76頁
文件大小: 646K
代理商: W78IRD2A
W78IRD2/W78IRD2A
- 58 -
16. H/W REBOOT MODE (BOOT FROM LDROM)
By default, the W78IRD2 boots up from the AP Flash EPROM after a power-on reset. Sometimes, this
is not desirable. H/W REBOOT mode forces the W78IRD2 to use the LD Flash EPROM instead and
execute in-system programming procedures. Enter H/W REBOOT mode using these settings.
H/W REBOOT MODE
P4.3
P2.7
P2.6
OPTION BIT
MODE
X
L
L
Bit4 = L
H/W REBOOT
L
X
X
Bit5 = L
H/W REBOOT
This might be implemented by connecting pins P2.6 and P2.7 to switches or jumpers. For example, in
a CD-ROM system, P2.6 and P2.7 might be connected to the PLAY and EJECT buttons on the panel.
If the user wants to enter H/W REBOOT mode, the user can press these two buttons at the same time
and then turn on the power to force the W78IRD2 to enter H/W REBOOT mode. After the power-on,
releasing both buttons finishes the in-system programming procedure.
This mode can be accidentally activated, so
be careful with the values of pins P2, P3, ALE,
EA
and
PSEN
at reset
.
The Reset Timing For Entering H/W
REBOOT Mode 1
P2.7
P2.6
RST
10us
20ms
Hi-Z
Hi-Z
H/W REBOOT Mode 2
P4.3
RST
10us
20ms
Hi-Z
Figure 16-1
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