IBM EM78M611E 用户手册
EM78M611E
Universal Serial Bus Series Microcontroller
12 •
•••
Product Specification (V1.1) 11.22.2006
(This specification is subject to change without further notice)
R3 [2] Zero flag. It will be set to 1 when the result of an arithmetic or logic operation is
zero.
R3 [3] Power down flag. It will be set to 1 during Power-on phase or by “WDTC”
command and cleared when the MCU enters into Power down mode. It remains
in its previous state after a Watchdog Reset.
in its previous state after a Watchdog Reset.
0
: Power down
1
: Power-on
R3 [4] Time-out flag. It will be set to 1 during Power-on phase or by “WDTC”
command. It is reset to 0 by WDT time-out.
0
: Watchdog timer overflow occurs
1
: No Watchdog timer overflow
The various states of Power down flag and Time-out flag at different conditions are
shown below:
shown below:
T
P
Condition
1
1
0
1
1
1
0
1
1
1
1
1
*
P
0
0
0
Power-on reset
WDTC instruction
WDT time-out
Power down mode
Wake up caused by port change during Power down mode
WDTC instruction
WDT time-out
Power down mode
Wake up caused by port change during Power down mode
*
P
: Previous status before WDT reset
R3 [5-7] Page selection bits. These three bits are used to select the program memory
page.
PS2
PS1
PS0
Program Memory Page [Address]
0
0
0
Page 0 [0000-03FF]
0
0
1
Page 1 [0400-07FF]
0
1
0
Page 2 [0800-0BFF]
0
1
1
Page 3 [0C00-0FFF]
1
0
0
Page 4 [1000-13FF]
1
0
1
Page 5 [1400-17FF]