參數(shù)資料
型號(hào)： MC68HC68T1
廠商： Motorola, Inc.
英文描述： Real-Time Clock plus RAM with Serial Interface
中文描述： 實(shí)時(shí)時(shí)鐘加RAM的串行接口
文件頁(yè)數(shù)： 1/26頁(yè)
文件大?。?/td> 342K
代理商： MC68HC68T1
MC68HC68T1
MOTOROLA
1
CMOS
The MC68HC68T1 HCMOS Clock/RAM peripheral contains a real–time
clock/calendar, a 32 x 8 static RAM, and a synchronous, serial, three–wire
interface for communication with a microcontroller or processor. Operating in a
burst mode, successive Clock/RAM locations can be read or written using only
a single starting address. An on–chip oscillator allows acceptance of a
selectable crystal frequency or the device can be programmed to accept a
50/60 Hz line input frequency.
The LINE and system voltage (VSYS) pins give the MC68HC68T1 the
capability for sensing power–up/power–down conditions, a capability useful for
battery–backup systems. The device has an interrupt output capable of
signaling a microcontroller or processor of an alarm, periodic interrupt, or power
sense condition. An alarm can be set for comparison with the seconds, minutes,
and hours registers. This alarm can be used in conjunction with the power
supply enable (PSE) output to initiate a system power–up sequence if the VSYS
pin is powered to the proper level.
A software power–down sequence can be initiated by setting a bit in the
interrupt control register. This applies a reset to the CPU via the CPUR pin, sets
the clock out (CLKOUT) and PSE pins low, and disables the serial interface.
This condition is held until a rising edge is sensed on the VSYS input pin,
signaling system power coming on, or by activation of a previously enabled
interrupt if the VSYS pin is powered up.
A watchdog circuit can be enabled that requires the microcontroller or
processor to toggle the slave select (SS) pin of the MC68HC68T1 periodically
without performing a serial transfer. If this condition is not met, the CPUR line
resets the CPU.
Full Clock Features — Seconds, Minutes, Hours (AM/PM), Day–of–Week,
Date, Month, Year (0 – 99), Auto Leap Year
32–Byte General Purpose RAM
Direct Interface to Motorola SPI and National MICROWIRE Serial Data
Ports
Minimum Timekeeping Voltage: 2.2 V
Burst Mode for Reading/Writing Successive Addresses in Clock/RAM
Selectable Crystal or 50/60 Hz Line Input Frequency
Clock Registers Utilize BCD Data
Buffered Clock Output for Driving CPU Clock, Timer, Colon, or LCD
Backplane
Power–On Reset with First Time–Up Bit
Freeze Circuit Eliminates Software Overhead During a Clock Read
Three Independent Interrupt Modes — Alarm, Periodic, or Power–Down
CPU Reset Output — Provides Orderly Power–Up/Power–Down
Watchdog Circuit
Pin–for–Pin Replacement for CDP68HC68T1
Chip Complexity: 8500 FETs or 2125 Equivalent Gates
Also See Application Notes ANE425 “Use of the MC68HC68T1 RTC with
M6805 Microprocessor”, AN457 “Providing a Real–Time Clock for the
MC68302”, and AN1065 “Use of the MC68HC68T1 Real–Time Clock with
Multiple Time Bases”
MICROWIRE is a trademark of National Semiconductor Inc.
Order this document
by MC68HC68T1/D
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
P SUFFIX
PLASTIC DIP
CASE 648
DW SUFFIX
SOG PACKAGE
CASE 751G
ORDERING INFORMATION
MC68HC68T1P
MC68HC68T1DW
Plastic DIP
SOG Package
16
1
16
1
13
14
15
16
9
10
11
12
5
4
3
2
1
8
7
6
VSYS
VBATT
XTALin
XTALout
VDD
PSE
POR
LINE
SCK
INT
CPUR
CLKOUT
VSS
SS
MISO
MOSI
REV 2
2/96
相關(guān)PDF資料
PDF描述
MC68HC68 Real-Time Clock plus RAM with Serial Interface
MC68HC908AZ32A CAC 4C 4#12 PIN PLUG
MC68HC908AZ32ACFU CAC 4C 4#12 PIN PLUG
MC68HC908AZ32AMFU CAC 4C 4#12 PIN PLUG
MC68HC908AZ32AVFU Microcontrollers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC68T1P 制造商:Motorola Inc 功能描述:
MC68HC705B16CFN 制造商:Motorola Inc 功能描述:
MC68HC705B16FN 制造商:Rochester Electronics LLC 功能描述:
MC68HC705B16NB 制造商:Rochester Electronics LLC 功能描述:
MC68HC705B16NCB 制造商:Rochester Electronics LLC 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*