EZ801905050MOD Datasheet, PDF (21/36 Pages) Zilog, Inc. – eZ80190 Module is a compact, high-performance Ethernet module

eZ801905050MOD
eZ80190 Module Product Specification
16
Table 5. Real-Time Clock Registers
Data
Function/Range BCD
Address D7 D6 D5 D4 D3 D2 D1 D0
Format
0
ST
10 Seconds
Seconds
Seconds
00–59
1
X
10 Minutes
Minutes
Minutes
00–59
2
CEB* CB
10 Hours
Hours
Hours 0–1/00–23
3
X
X
X
X
X
Day
Day
01–07
4
X
X
10 Date
Date
Date
01-31
5
X
X
X 10 M.
Month
Month
01–12
6
10 Years
Years
Year
00–99
7
OUT FT
S
Calibration
Control
Notes: *When CEB is set to 1, CB toggles from 0 to 1 or from 1 to 0 every 100 years, depending upon the initial vale
set. When CEB is set to 0, CB does not toggle.
Keys: S = Sign bit, FT = Frequency Test bit, ST = Stop bit, OUT = Output level, X = Don’t care, CEB = Century
Enable bit, CB = Century Bit.
For further details, please refer to the M41T11 data sheet from SGS-Thomson at
www.st.com.
Reset Generator
The onboard Reset Generator Chip performs reliable Power-On Reset. The chip
generates a reset pulse with a duration of 200 ms if the power supply drops below
2.93 V. This reset pulse ensures that the board always starts in a defined condi-
tion. The RESET pin on the I/O connector reflects the status of the RESET line. It
is a bidirectional pin for resetting external peripheral components or for resetting
the eZ80190 with a low-impedance output (e.g. a 100-Ohm pushbutton).
Serial Interface Ports
The processor contains two 16550-style UARTs with programmable baud rate
generators. When the eZ80190 Module is plugged in to the eZ80^® Development
Platform, UART0 is connected to a console connector and UART1 is connected to
a modem connector. There are no RS232-level shifters on the eZ80190.
Note: Do not connect an RS-232 interface without level shifters.
PS019101-1003
PRELIMINARY
Reset Generator