em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 153

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
Address Bank, Name
0X3B
0X3C
0X39
BANK 1, R3B
BANK 1, R3C
BANK 1, R38
PRDxL
TBDT
DTxL
(Continuation)
6.11.3 The Status of RST, T, and P of STATUS Register
A RESET condition is initiated by the following events:
1) A power-on condition,
2) A high-low-high pulse on /RESET pin, and
3) Watchdog timer time-out.
The values of T and P as listed in the following table are used to check how the
processor wakes up.
*
The table below shows the events that may affect the status of T and P.
*
Power on
/RESET during Operating mode
/RESET wake-up during SLEEP mode
WDT during Operating mode
WDT wake-up during SLEEP mode
Wake-Up on pin change during SLEEP mode
Power on
WDTC instruction
WDT time-out
SLEP instruction
Wake-Up on pin change during SLEEP mode
Previous status before reset
Previous status before reset
Values of RST, T, and P after RESET:
Status of T and P Being Affected by Events:
Bit Name
Power-On
/RESET and WDT
Wake-Up from Pin
Change
Bit Name
Power-On
/RESET and WDT
Wake-Up from Pin
Change
Bit Name
Power-On
/RESET and WDT
Wake-Up from Pin
Change
Reset Type
Reset Type
DTB[9] DTB[8] DTB[7] DTB[6] DTB[5] DTB[4] DTB[3] DTB[2]
Event
Bit 7
P
0
0
0
0
0
0
0
0
0
0
Bit 6
P
0
0
0
0
0
0
0
0
0
0
EM78F648/644/642/641/548/544/542/541N
Bit 5
P
P
P
0
0
0
0
0
0
0
0
Bit 4
0
P
0
P
0
P
0
0
0
0
0
PRDB[1] PRDB[0] PRDA[1] PRDA[0]
DTB[1] DTB[0] DTA[1] DTA[0]
Bit 3
0
P
0
P
0
P
0
0
0
P
T
1
1
0
0
1
T
1
1
0
1
1
*
8-Bit Microcontroller
Bit 2
P
P
0
0
0
0
P
0
0
Bit 1
P
P
P
0
0
0
0
0
0
P
P
P
P
P
1
0
0
0
1
1
0
0
*
*
*
Bit 0
• 143
P
P
P
0
0
0
0
0
0