EZ80F91MCU Datasheet, PDF (191/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
172
Real-Time Clock Day-of-the-Month Register
This register contains the current day-of-the-month count. The RTC_DOM regis-
ter begins counting at 01h. The value in the RTC_DOM register is unchanged by a
RESET. The current setting of BCD_EN determines whether the values in this
register are binary (BCD_EN = 0) or binary-coded decimal (BCD_EN = 1). Access
to this register is Read Only if the RTC is locked and Read/Write if the RTC is
unlocked. See Table 84.
Table 84. Real-Time Clock Day-of-the-Month Register
(RTC_DOM = 00E4h)
Bit
7
6
5
4
3
2
1
0
Reset
X
X
X
X
X
X
X
X
CPU Access
R/W* R/W* R/W* R/W* R/W* R/W* R/W* R/W*
Note: X = Unchanged by RESET; R/W* = Read Only if RTC locked, Read/Write if RTC unlocked.
Binary-Coded-Decimal Operation (BCD_EN = 1)
Bit
Position
[7:4]
TENS_DOM
[3:0]
DOM
Value Description
0–3 The tens digit of the current day-of-the-month count.
0–9 The ones digit of the current day-of-the-month count.
Binary Operation (BCD_EN = 0)
Bit
Position
[7:0]
DOM
Value Description
01h– The current day-of-the-month count.
1Fh
PS019209-0504
PRELIMINARY
Real-Time Clock