EZ80F92AZ020EG Zilog, EZ80F92AZ020EG Datasheet - Page 97

• Manufacturer Part Number: EZ80F92AZ020EG
• Description: IC ACCLAIM MCU 128KB 100LQFP
• Manufacturer: Zilog
• Series: eZ80® Acclaim!®r

Specifications of EZ80F92AZ020EG

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 24
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 100-LQFP
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: I2C, IrDA, SPI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 6
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 269-3871; EZ80F92AZ020EG

PS015313-0508
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
Table
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
Write values to the RTC alarm registers to set the appropriate alarm conditions
Write to RTC_CTRL to clear the RTC_UNLOCK bit; clearing the RTC_UNLOCK bit
resets and enables the clock divider
38.
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.
X
7
R/W*
X
6
R/W*
X
5
R/W*
X
4
R/W*
X
3
Product Specification
R/W*
X
2
Real-Time Clock
R/W*
X
1
R/W*
X
0
90