Model-specific configuration registers
Placement of configuration values
"~" means the bit is a negated boolean. Sometimes values overlap,
depending on MCU model.
In STC12A series, the first 7 MCS bytes have active
values. Generally, unused bits should be set to 1.
MCS0
----
MSB 7 6 5 4 3 2 1 0 LSB
CLKSRC
CLKSRC := clock source (0 = internal RC, 1 = external crystal)
MCS1
----
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 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
MCS2
----
MSB 7 6 5 4 3 2 1 0 LSB
~EERE ~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.
MCS3 (at index 6!)
------------------
MSB 7 6 5 4 3 2 1 0 LSB
LVD
LVD := low voltage detection threshold
LVD threshold
0 3.7V
1 3.3V