Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 4 Power Management
FEUL620Q504 4-3
4.2.2 Stop Code Acceptor (STPACP)
Address: 0F008H
Access: W
Access size: 8 bits
Initial value: -(Undefined)
7 6 5 4 3 2 1 0
STPACP – – – – – – – –
R/W W W W W W W W W
Initial value - - - - - - - -
STPACP is a write-only special function register (SFR) that is used for setting a STOP mode.
When STPACP is read, “00H” is read.
When data is written to STPACP in the order of “5nH” and “0AnH” (where n is 0 to 0FH), the stop code
acceptor is enabled. When the STP bit of the standby control register (SBYCON) is set to “1” in this state, the
mode is changed to the STOP mode. When the STOP mode is set, the STOP code acceptor is disabled.
When another instruction is executed between the instruction that writes “5nH” to STPACP and the instruction
that writes “0AnH”, the stop code acceptor is enabled after “0AnH” is written. Note that, if data other than
“0AnH” is written to STPACP after “5nH” is written, the “5nH” writing process becomes invalid and “5nH”
should be written again.
During a system reset, the stop code acceptor is disabled.
[Note]
•The STOP code acceptor cannot be enabled on the condition that any interrupt enable flag and the
corresponding interrupt request flag are both “1” (for example, an interrupt request occurs when the MIE flag
is ”0”).