EZ80F920120MOD Zilog, EZ80F920120MOD Datasheet - Page 104

• Manufacturer Part Number: EZ80F920120MOD
• Description: MODULE EZ80F92 512K 20MHZ
• Manufacturer: Zilog

Specifications of EZ80F920120MOD

• Module/board Type: Development Module
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1 MB
• Interface Type: Cable
• Maximum Clock Frequency: 20 MHz
• Operating Supply Voltage: 0 V to 3.3 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: 0 C
• For Use With/related Products: eZ80F92
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3157; EZ80F920120MOD

PS015308-0404
Real-Time Clock Registers
•
The Real-Time Clock registers are accessed via the address and data bus using I/O instruc-
tions. 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
Real-Time Clock Seconds Register (RTC_SEC = 00E0h).
Table 39. 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
Write to RTC_CTRL to clear the RTC_UNLOCK bit; clearing the RTC_UNLOCK bit
resets and enables the clock divider
Value Description
0–5
0–9
Value Description
00h–
3Bh
R/W*
The tens digit of the current seconds count.
The ones digit of the current seconds count.
The current seconds count.
P R E L I M I N A R Y
X
7
R/W*
6
X
R/W*
X
5
R/W*
X
4
R/W*
X
3
Product Specification
R/W*
X
2
eZ80F92/eZ80F93
Real-Time Clock
R/W*
X
1
R/W*
X
0
92