參數(shù)資料
型號(hào)： W78C374B
廠商： WINBOND ELECTRONICS CORP
英文描述： MONITOR MICROCONTROLLER
中文描述： 顯示器單片機(jī)
文件頁數(shù)： 17/38頁
文件大小： 396K
代理商： W78C374B
Preliminary W78E378/W78C378/W78C374
Publication Release Date: December 1999
- 17 - Revision A1
To use DDC1 port, a user should pay attention to the following items:
(1) When the chip is powered-on or after reset , the 8-bit shift register in DDC1 H/W contains all 0s. If
you write a data to the latch buffer (the DDC1 register), it will be loaded to the shift register at the
9th clock (on V
IN
), so from the 10th clock, the real data bit begins to shift out.
(2) Because there is no reset signal to the latch buffer, it contains a random data after power-on. If
you enable DDC1 without writing data to the latch buffer, SDA will have the random data shifted
out after 9 clocks. The shift register is reset to 00H during CPU reset.
(3) The DDC1 H/W has a counter that counts how many bits shifted out. This counter is initialized to 0
when power-up or reset. When you firstly enable DDC1 after power-on, the first bit is already
shifted out without clock, so the first clock triggers the second data bit (D6) to shift out and "0000
0001 1" will be got. After the first 9 clocks that shift out an invalid byte, the counter counts from 1
to 9 cyclically according to the clock pulse on V
IN
-pin. See the following illustration.
After power on, the
counter count:
0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 ...
shifted-out data bit:
0
0 0 0 0 0 0 0 1
1
D7 D6 D5 D4 D3 D2 D1 D0
ack
D7 D6 D5 D4 D3 D2 D1 D0
ack …
V
IN
clock pulse:
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 ...
|--> invalid data |--> normal data
(4) The interrupt happens on the failing edge of the following first clock. The next data, which is about
to be shifted out, in the latch buffer is loaded into the shift register at the rising edge of the
following first clock. At the same time, data bit D7 is shifted out and the counter value is "1".
SIO1 Port (with two slave addresses)
The SIO1 port is a serial I/O port, which supports all transfer modes from and to the I
2
C bus. The
SIO1 port handles byte transfers autonomously. To enable this port, the bit ENDDC1 in CTRL1
should be cleared to '0'. The CPU interfaces to the SIO1 port through the following five special
function registers:
S1CON
(control register, D8h),
S1STA
(status register, D9h),
S1DAT
(data
register, DAh) and
S1ADR1
/
S1ADR2
(address registers, DBh/DCh). The SIO1 H/W interfaces to the
I
2
C bus via two pins: SDA (P3.0, serial clock line) and SCL (P3.1, serial data line). The output latches
of P3.0 and P3.1 must be set to "1" before using this port.
SIO2 Port (with two slave addresses)
The function of this port is the same as SIO1 port. The CPU interfaces to the SIO2 port through the
following five special function registers:
S2CON
(control register, E8h),
S2STA
(status register, E9h),
S2DAT
(data register, EAh) and
S2ADR1
/
S2ADR2
(address registers, EBh/ECh). The SIO2 H/W
interfaces to the I
C bus via two pins: SDA2 (P4.5, serial clock line) and SCL2 (P4.4, serial data line).
The output latches of P4.5 and P4.4 must be set to "1" before using this port.
Operation of SIO1 Port:
(SIO2 has the same function except their addresses of control registers)
相關(guān)PDF資料
PDF描述
W78C374P MONITOR MICROCONTROLLER
W78C378 MONITOR MICROCONTROLLER
W78C378P MONITOR MICROCONTROLLER
W78E378 MONITOR MICROCONTROLLER
W78E378P MONITOR MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W78C374P 制造商:WINBOND 制造商全稱:Winbond 功能描述:MONITOR MICROCONTROLLER
W78C378 制造商:WINBOND 制造商全稱:Winbond 功能描述:MONITOR MICROCONTROLLER
W78C378P 制造商:WINBOND 制造商全稱:Winbond 功能描述:MONITOR MICROCONTROLLER
W78C438 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT EMULATION MICROCONTROLLER
W78C438BF-16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。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。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

我的聯(lián)系方式

*
*
*