參數(shù)資料
型號: ATAM893T-TKQ
廠商: Atmel
文件頁數(shù): 18/98頁
文件大小: 0K
描述: IC MON TIRE-PRESS ATARX9X SER
標準包裝: 4,000
系列: MARC4
核心處理器: MARC4
芯體尺寸: 4-位
速度: 4MHz
連通性: SSI(2 線,3 線)
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: EEPROM
EEPROM 大小: 64 x 16
RAM 容量: 256 x 4
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 6.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 20-SOIC(0.209",5.30mm 寬)
包裝: 帶卷 (TR)
25
4680C–4BMCU–01/05
ATAM893-D
Figure 5-2.
Bi-directional Port 1
5.2.2
Bi-directional Port 2
As all other bi-directional ports, this port includes a bit-wise programmable Control Register
(P2CR), which enables the individual programming of each port bit as input or output. It also
opens up the possibility of reading the pin condition when in output mode. This is a useful fea-
ture for self testing and for serial bus applications.
However, Port 2 has an increased drive capability and an additional low resistance pull-up/-
down transistor mask option.
Note:
Care should be taken connecting external components to BP20/NTE. During any reset phase, the
BP20/NTE input is driven towards V
DD by an additional internal strong pull-up transistor. This pin
must not be pulled down (active or passive) to VSS during reset by any external circuitry represent-
ing a resistor of less than 150 k
. This prevents the circuit from unintended switching to test mode
enable through the application circuitry at pin BP20/NTE. Resistors less than 150 k
might lead to
an undefined state of the internal test logic, thus disabling the application firmware.
To avoid any conflict with the optional internal pull-down transistors, BP20 handles the pull-down
options in a different way than all other ports. BP20 is the only port that switches off the pull-down
transistors during reset.
OUT
IN
Reset
I/O Bus
D
R
S
Q
NQ
R
Master reset
P1DATy
(Data out)
(Direction)
BP1y
V
DD
Switched
pull-up
(1)
(1) Flash options
Static
pull-up
Static
pull-down
Switched
pull-down
V
DD
(1)
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