EZ80L92AZ020EC Zilog, EZ80L92AZ020EC Datasheet - Page 96
EZ80L92AZ020EC
Manufacturer Part Number
EZ80L92AZ020EC
Description
IC WEBSERVER 20MHZ 100LQFP
Manufacturer
Zilog
Datasheet
1.EZ80L92AZ020SG.pdf
(231 pages)
Specifications of EZ80L92AZ020EC
Processor Type
eZ80
Features
High Speed, Single-Cycle Instruction-Fetch
Speed
20MHz
Voltage
3.3V
Mounting Type
Surface Mount
Package / Case
100-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
269-3167
EZ80L92AZ020EC
EZ80L92AZ020EC
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PS013014-0107
Real Time Clock Registers
The real time clock registers are accessed via the address and data bus using I/O
instructions. RTC_UNLOCK controls access to the RTC count registers. When unlocked
(RTC_UNLOCK = 1), the RTC count is disabled and the count registers are Read/Write.
When locked (RTC_UNLOCK = 0), the RTC count is enabled and the count registers are
Read-Only. The default, at RESET, is for the RTC to be locked.
Real Time Clock Seconds Register
This register contains the current seconds count. The value in the RTC_SEC 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 38. Real Time Clock Seconds Register (RTC_SEC = 00E0h)
Bit
Reset
CPU Access
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]
TEN_SEC
[3:0]
SEC
Binary Operation (BCD_EN = 0)
Bit
Position
[7:0]
SEC
Table
38.
Value Description
0–5
0–9
Value
00h–3Bh The current seconds count.
R/W*
The tens digit of the current seconds count.
The ones digit of the current seconds count.
X
7
Description
R/W*
X
6
R/W*
X
5
R/W*
X
4
R/W*
X
3
Product Specification
R/W*
X
2
R/W*
Real Time Clock
X
1
R/W*
X
0
90
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