EZ80F91MCU Datasheet, PDF (194/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
175
Real-Time Clock Century Register
This register contains the current century count. The value in the RTC_CEN regis-
ter 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 deci-
mal (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 87.
Table 87. Real-Time Clock Century Register
(RTC_CEN = 00E7h)
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_CEN
[3:0]
CEN
Value Description
0–9 The tens digit of the current century count.
0–9 The ones digit of the current century count.
Binary Operation (BCD_EN = 0)
Bit
Position
[7:0]
CEN
Value Description
00h– The current century count.
63h
PS019209-0504
PRELIMINARY
Real-Time Clock