Zilog Z80230 - Manual (Page 193)

SCC/ESCC
User Manual
UM010903-0515 Register Descriptions
186
Read Register 11 (ESCC and 85C30 Only)
On the ESCC, Read Register 11 reflects the contents of Write Register 10 provided the Extended
Read option has been enabled. Otherwise, this register returns an image of RR15.
On the NMOS/CMOS version, a read to this location returns an image of RR15.
Read Register 12
RR12 returns the value stored in WR12, the lower byte of the time constant, for the BRG. Figure
displays the bit positions for RR12.
Read Register 12
D7 D6 D5 D4 D3 D2 D1 D0
Read Register 12
TC0
TC1
TC2
TC3
TC4
TC5
TC6
TC7
Lower Byte
of Time Constant