參數(shù)資料
型號: S1C621C0D
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC74
封裝: DIE-74
文件頁數(shù): 33/108頁
文件大?。?/td> 992K
代理商: S1C621C0D
22
EPSON
S1C621C0 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
4.5 Output Ports (R00–R03)
4.5.1 Configuration of output ports
The S1C621C0 has 4 bits general output ports.
Output specifications of the output ports can be selected individually with the mask option. Two kinds of
output specifications are available: complementary output and Nch open drain output.
Further, the output port R00–R03 to be used as special output ports by the software setting.
Figure 4.5.1.1 shows the configuration of the output port.
VDD
VSS
Rxx
Data
bus
Address
Data register
Mask
option
Fig. 4.5.1.1 Configuration of output port
4.5.2 Mask option
Output specifications of the output ports can be selected with the mask option.
Output specifications for the output ports (R00–R03) enable selection of either complementary output or
Nch open drain output for each of the 4 bits.
The Nch open drain output is suitable for the common output for key matrix and the other outputs.
However, even when Nch open drain output is selected, voltage exceeding source voltage must not be
applied to the output port.
Select complementary output set in default for unused output port.
4.5.3 Special output
In addition to the regular DC output, special output can be selected for the output ports R00–R03 as shown
in Table 4.5.3.1 with the software. Figure 4.5.3.1 shows the configuration of the special output.
Table 4.5.3.1 Special output
Terminal
R03
R02
R01
R00
Special output
BZ
FOUT
REMDC
REMCR
Output enable register
BZE
FOUTE
REMDC
REMCR
Fig. 4.5.3.1
Configuration of special output
Data
bus
REMCR
R00 output
Register
REMCR
Register
R00
REMDC
R01 output
Register
REMDC
Register
R01
FOUT
R02 output
Register
FOUTE
Register
R02
BZ
R03 output
Register
BZE
Register
R03
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