Model-specific configuration registers
Placement of configuration values
"~" means the bit is a negated boolean. Sometimes values overlap,
depending on MCU model.
In STC15 series, the first 13 MCS bytes have active values. Generally,
unused bits should be set to 1.
MCS0
----
MSB 7 6 5 4 3 2 1 0 LSB
RSPEN
RSPEN := RESET pin enable
MCS1
----
MSB 7 6 5 4 3 2 1 0 LSB
EEIH LVRS LVD2 LVD1 LVD0
EEIH := inhibit EEPROM writes in low-voltage conditions enable
LVRS := low-voltage reset enable
LVD2...LVD0 := low voltage detection threshold
LVD2 LVD1 LVD0 value
0 0 0 setting 0 (e.g. 3.14V)
0 0 1 setting 1 (e.g. 3.28V)
0 1 0 setting 2 (e.g. 3.43V)
0 1 1 setting 3 (e.g. 3.61V)
1 0 0 setting 4 (e.g. 3.82V)
1 0 1 setting 5 (e.g. 4.05V)
1 1 0 unknown
1 1 1 unknown
The exact voltages depend on MCU model.
MCS2
----
MSB 7 6 5 4 3 2 1 0 LSB
~WDEN ~WDSTP WDPS2 WDPS1 WDPS0
~WDEN := watchdog enable after power-on-reset
~WDSTP := stop watchdog counter in idle mode
WDPS2...WDPS0 := watchdog counter prescaler
WDPS2 WDPS1 WDPS0 divisior
0 0 0 2
0 0 1 4
0 1 0 8
0 1 1 16
1 0 0 32
1 0 1 64
1 1 0 128
1 1 1 256
This is completely similar to STC12.
MCS3...MCS11
------------
All bytes set to 0xff.
MCS12
-----
MSB 7 6 5 4 3 2 1 0 LSB
~EREE ~BSLD
~EREE := enable eeprom erase next time MCU is programmed
~BSLD := enable BSL pin detect; i.e. BSL is only enabled if P1.0/P1.1
(or others, depends on MCU model) are held low on POR.
This is like MCS3 of STC12.