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參數(shù)資料
| 型號： | PCD3745AT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit microcontroller with 4.5 kbytes OTP memory and 32 kHz real-time clock |
| 中文描述： | 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | 7.50 MM, PLASTIC, MS-013AE, SOT-136-1, SOP-28 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大小： | 156K |
| 代理商： | PCD3745AT |
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1999 Feb 02
9
Philips Semiconductors
Product specification
8-bit microcontroller with 4.5 kbytes OTP
memory and 32 kHz real-time clock
PCD3745A
6.4
Clock Control Register (CLCR)
Table 3
Clock Control Register (address 20H)
Table 4
Description of CLCR bits
6.5
Frequency Adjustment Register (FAR)
Table 5
Frequency Adjustment Register (address 21H)
Table 6
Description of FAR bits
7
6
5
4
3
2
1
0
SITS
TST2
TST1
ERCO
RUN
ITS
CIF
ECI
BIT
SYMBOL
DESCRIPTION
7
SITS
Second Interrupt Time Select.
If SITS = 1 and ITS = 1, then the interrupt time is
1.5 seconds.
Test 2 input.
This is a test bit and must be fixed at zero by user software.
Test 1 input.
This is a test bit and must be fixed at zero by user software.
Enable 16 kHz Clock Output.
If ERCO = 0, then P1.7/RCO is a port line. If ERCO = 1,
then P1.7/RCO is a 16 kHz clock output. The port instructions for P1.7/RCO are not
inhibited and therefore the state of both the port line and flip-flop may be read in and the
port flip-flop may be written to by port instructions.
Clock Run/Stop.
If RUN = 0, then the 32 kHz oscillator is stopped and the divider chain
is reset. If RUN = 1, then the 32 kHz oscillator and the divider chain are running.
Interrupt Time Select.
If ITS = 1 and SITS = 0, then the interrupt time is one second. If
ITS = 0 and SITS = X, then the interrupt time is one minute.
Clock Interrupt Flag.
Set by hardware, if RTC divider chain overflows (every second,
1.5 second or minute depending on ITS) or by software. Reset: by software.
Enable Clock Interrupt.
If ECI = 0, the RTC interrupt is disabled. If ECI = 1, the RTC
interrupt is enabled.
6
5
4
TST2
TST1
ERCO
3
RUN
2
ITS
1
CIF
0
ECI
7
6
5
4
3
2
1
0
FAR7
FAR6
FAR5
FAR4
FAR3
FAR2
FAR1
FAR0
BIT
SYMBOL
DESCRIPTION
7
6
5
4
3
2
1
0
FAR7
FAR6
FAR5
FAR4
FAR3
FAR2
FAR1
FAR0
The state of these 8-bits determine the frequency adjustment value for the real-time
clock section; see Table 7.
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