Z85233 Datasheet, PDF (134/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

SCC™/ESCC™ User’s Manual
Register Descriptions
5.3.12 Read Register 11 (ESCC and 85C30
Only)
5.3.15 Read Register 14 (ESCC and 85C30
On the ESCC, Read Register 11 reflects the contents of
Write Register 10 provided the Extended Read option has
Only)
On the ESCC, Read Register 14 reflects the contents of
5
been enabled. Otherwise, this register returns an image of _{Write Register 7 Prime provided the Extended Read option}
RR15.
has been enabled. Otherwise, this register returns an im-
age of RR10.
On the NMOS/CMOS version, a read to this location re-
turns an image of RR15.
On the NMOS/CMOS version, a read to this location re-
5.3.13 Read Register 12
turns an image of RR10.
RR12 returns the value stored in WR12, the lower byte of ^{5.3.16 Read Register 15}
the time constant, for the BRG. Figure 5-26 shows the bit _{RR15 reflects the value stored in WR15, the}
positions for RR12.
External/Status IE bits. The two unused bits are always
returned as Os. Figure 5-28 shows the bit positions for
Read Register 12
RR15.
D7 D6 D5 D4 D3 D2 D1 D0
Read Register 15
TC0
TC1
TC2
TC3
Lower Byte
TC4
of Time Constant
TC5
TC6
TC7
D7 D6 D5 D4 D3 D2 D1 D0
0
Zero Count IE
0
DCD IE
Sync/Hunt IE
CTS IE
Figure 5-26. Read Register 12
Tx Underrun/EOM IE
Break/Abort IE
5.3.14 Read Register 13
RR13 returns the value stored in WR13, the upper byte of
the time constant for the BRG. Figure 5-27 shows the bit
positions for RR13.
Figure 5-28. Read Register 15
Read Register 13
D7 D6 D5 D4 D3 D2 D1 D0
TC8
TC9
TC10
TC11
TC12
TC13
TC14
TC15
Upper Byte
of Time Constant
Figure 5-27. Read Register 13
UM010901-0601
5-27