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参数资料
| 型号： | RTC-72421B |
| 厂商： | EPSON TOYOCOM CORP |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP18 |
| 封装： | DIP-18 |
| 文件页数： | 15/26页 |
| 文件大小： | 192K |
| 代理商： | RTC-72421B |
RTC - 72421 / 72423
Page - 18
MQ162-04
! Examples of connection to general-purpose microprocessor
When connecting the RTC-72421/RTC-72423 to a microprocessor, carefully check the AC timings of both the RTC and the
microprocessor.
1. Connection to multiplexed bus type
AD3
AD2
AD1
AD0
IO/M
ALE
RD
WR
Decoder
A3
A2
A1
A0
D3
D2
D1
D0
CS0
ALE
RD
WR
8085/MCS48,51
RTC-72421/3
Upper address bus
AD3
AD2
AD1
AD0
Upper address bus
IO/M
ALE
RD
WR
Decoder
A3
A2
A1
A0
D3
D2
D1
D0
CS0
ALE
RD
WR
8085/MCS48,51
RTC-72421/3
Latch
The resistors on the RD and WR lines are not necessary if the CPU does not have a HALT or HOLD state.
2. Connection to Z80 or compatible CPU
A3
A2
A1
A0
Upper address bus
RD
WR
Decoder
A3
A2
A1
A0
D3
D2
D1
D0
CS0
ALE
RD
WR
Z80, SMC84C00AC
RTC-72421/3
D3
D2
D1
D0
IORQ
MEMRQ
or
*Select IORQ or MEMRQ depending on whether the RTC maps I/O or memory of the CPU.
3. Connection to 68-series MPU
A3
A2
A1
A0
Upper address bus
R/W
E
Decoder
A3
A2
A1
A0
D3
D2
D1
D0
CS0
ALE
RD
WR
68 series MPU
RTC-72421/3
D3
D2
D1
D0
相关PDF资料 |
PDF描述 |
|---|---|
| RTC-72423A-0 | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| RTC-72423B-0 | REAL TIME CLOCK, PDSO24 |
| RTC-72423A-0 | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| RTC-72423B-0 | REAL TIME CLOCK, PDSO24 |
| RTC-7301SFB | REAL TIME CLOCK, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| RTC-72421B PURE SN | 制造商:Epson Electronics America Inc 功能描述:REAL TIME CLOCK MODULE 4-BIT |
| RTC72421B | 制造商:Epson Toyocom Corporation 功能描述:IC RTC 72421 DIP18 |
| RTC-72421B0 ROHS | 制造商:Epson Electronics America Inc 功能描述: |
| RTC72423 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:4-bit REAL TIME CLOCK MODULE |
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