Sharp CE-150 - Page 311

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(f) MSK register
MSK
1 6 s. 4 3
xlx!xlxl
..__.__.__.___.'-;-'-1-;""'":::'. _ _,. , Interru pt mas ~ bit for IRQ
'----l>) • [ lnte (tu pt 1nask bit for PB7
~ I nterrup t mask b it for rece ii.• er flag RD
'---- --~) ~ r llerr u pl n1ask bit fot 1ra n smittcr flag TD
I nterr u pt enabled \'.'t le n tt 1e bit is ··1".
The MSK rcgi~t c r can read/ write data when regist er is selected (IOIO).
-
-
NOT E: Wh an the c on1 ents of t he MSK register are re ad . the con te nt s of CL 1, SD1, P B7 . and
IRO ate st ored in h igh otd er digi1 positions.
** CLI $01 PB7 IRQ M~K M~K MfK MgK
Contents of MS K read
@ IF register
IF
7 6 5 4 3 2 1 0
1 x 1 x 1 x 1 x 1 TO [RO]"Tn
1
~ 1
I
I '-- ) Set at the ris in g e dge of I RQ in pu t.
. ~. --~ > Set at the rising e <lg e of PB7 input.
'-- ---- :> Set up on completio n of serial inp ut receive.
RO is reset \ •1 hc n t he CPU r ece ived data is
read or 1he co 1Hents of the U < egist er ar e tead.
Set up o1 ) con )pl et ioo ot set ia l da ta
transmission.
Reset
\Vhe n the CJ'lU load the transfer fi ng
s er ial data to the L register.
IFO and I Fl can read/ write da ta when regis ter is selected (IOI I).
RD and T D are dedicated to read only.
NOI E: Dur ing H . ~ c e iv e ot se rial data , RO is reset. Term" ser ial data rc ceive" means the period
dur i ng which an 8- bi1 data is in reception. \ Vh h the start b it exc luded.
© ODA ~g i ster
DOA
., 6 s
CCf
4 3 Z I 0
l_J_l_l_i_I
The regist er used to determine the dir ection of the port PA.
i- lh bil of l he ODA register
When 0 PAi is in t hP. i np ut mode.
When 1
PA i is in the o utpu t rno de and 01..11 pu ts the co ntent s o O P i.
DDA can read/ write when the regist er is selected (1 1 00 ).
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