CDP68HC68T1 데이터 시트보기 (PDF) - Renesas Electronics
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CDP68HC68T1 Datasheet PDF : 24 Pages
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DATASHEET
CDP68HC68T1
CMOS Serial Real-Time Clock With RAM and Power Sense/Control
FN1547
Rev 9.00
Decemember 8, 2015
The CDP68HC68T1 Real-Time Clock provides a
time/calendar function, a 32 byte static RAM, and a 3 wire
Serial Peripheral Interface (SPI Bus). The primary function of
the clock is to divide down a frequency input that can be
supplied by the on-board oscillator in conjunction with an
external crystal or by an external clock source. The internal
oscillator can operate with a 32kHz, 1MHz, 2MHz, or 4MHz
crystal. An external clock source with a 32kHz, 1MHz, 2MHz,
4MHz, 50Hz or 60Hz frequency can be used to drive the
CDP68HC68T1. The time registers hold seconds, minutes,
and hours, while the calendar registers hold day-of-week,
date, month, and year information. The data is stored in BCD
format. In addition, 12 or 24 hour operation can be selected.
In 12 hour mode, an AM/PM indicator is provided. The T1
has a programmable output which can provide one of seven
outputs for use elsewhere in the system.
Computer handshaking is controlled with a “wired-OR” interrupt
output. The interrupt can be programmed to provide a signal as
the result of:
1. An alarm programmed to occur at a predetermined
combination of seconds, minutes, and hours.
2. One of 15 periodic interrupts ranging from sub-second to
once per day frequency.
3. A power fail detect. The PSE output and the VSYS input are
used for external power control. The CPUR output is
available to reset the processor under power-down
conditions. CPUR is enabled under software control and
can also be activated via the CDP68HC68T1’s watchdog. If
enabled, the watchdog requires a periodic toggle of the CE
pin without a serial transfer.
Features
• SPI (Serial Peripheral Interface)
• Full Clock Features
- Seconds, Minutes, Hours (12/24, AM/PM), Day of
Week, Date, Month, Year (0 to 99), Automatic Leap Year
• 32 Wordx8-Bit RAM
• Seconds, Minutes, Hours Alarm
• Automatic Power Loss Detection
• Low Minimum Standby (Timekeeping) Voltage . . . . . 2.2V
• Selectable Crystal or 50/60Hz Line Input
• Buffered Clock Output
• Battery Input Pin that Powers Oscillator and also
Connects to VDD Pin When Power Fails
• Three Independent Interrupt Modes
- Alarm
- Periodic
- Power-Down Sense
• Pb-Free Available (RoHS Compliant)
Pinouts
CDP68HC68T1
(16 LD PDIP, SOIC)
TOP VIEW
CLKOUT 1
CPUR 2
INT 3
SCK 4
MOSI 5
MISO 6
CE 7
VSS 8
16 VDD
15 XTAL OUT
14 XTAL IN
13 VBATT
12 VSYS
11 LINE
10 POR
9 PSE
CDP68HC68T1
(20 LD SOIC)
TOP VIEW
CLK OUT 1
CPUR 2
INT 3
NC 4
SCK 5
MOSI 6
MISO 7
CE 8
VSS 9
PSE 10
20 VDD
19 XTAL OUT
18 XTAL IN
17 NC
16 VBATT
15 VSYS
14 NC
13 NC
12 LINE
11 POR
FN1547 Rev 9.00
Decemember 8, 2015
Page 1 of 24
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