EZ80F91NA050SC Zilog, EZ80F91NA050SC Datasheet - Page 168

• Manufacturer Part Number: EZ80F91NA050SC
• Description: IC ACCLAIM MCU 256KB 144-BGA
• Manufacturer: Zilog
• Series: eZ80® Acclaim!®r

Specifications of EZ80F91NA050SC

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: Ethernet, I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 144-LBGA
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 50 MHz
• Data Ram Size: 16 KB
• Number Of Programmable I/os: 32
• Number Of Timers: 16 Bit
• Operating Supply Voltage: 3 V to 3.6 V
• Mounting Style: SMD/SMT
• Height: 1.5 mm
• Length: 13 mm
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Width: 13 mm
• For Use With: 269-4712 - KIT DEV ENCORE 32 SERIES269-4671 - BOARD ZDOTS SBC Z80ACCLAIM PLUS269-4561 - KIT DEV FOR EZ80F91 W/C-COMPILER269-4560 - KIT DEV FOR EZ80F91 W/C-COMPILER
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No RoHS Version Available
• Other names: 269-3251

Real-Time Clock
PS019215-0910
System Clock
Note:
Real-Time Clock Overview
The Real-Time Clock (RTC) maintains time by keeping count of seconds, minutes, hours,
day-of-the-week, day-of-the-month, year, and century. The current time is kept in 24-hour
format. The format for all count and alarm registers is selectable between binary and
binary-coded-decimal (BCD) operations. The calendar operation maintains the correct
day-of-the-month and automatically compensates for leap year. A simplified block
diagram of the RTC and the associated on-chip, low-power, 32 kHz oscillator is displayed
in
displayed in
For users NOT using the RTC the following RTC signal pins must be connected as follows
to avoid a 10 uA leakage within the RTC circuit block. RTC_Xin (pin 61) must be left float-
ing or connected to ground.
Figure 35. Real-Time Clock and 32 kHz Oscillator Block Diagram
Figure
IRQ
ADDR[15:0]
DATA[7:0]
Real-Time Clock
35. Connections to an external battery supply and 32 kHz crystal network is also
V
RTC Clock
DD
Figure
(RTC_CTRL[4])
35.
CLK_SEL
Enable
V
DD
Low-Power
32 KHz Oscillator
RTC_X
RTC_X
RTC_V
DD
OUT
IN
32 KHz
Crystal
R1
Product Specification
Battery
Real-Time Clock
C
C
159