參數(shù)資料
型號(hào)： S1C88848D0A0100
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC192
封裝： DIE-192
文件頁數(shù)： 106/174頁
文件大?。?/td> 1304K
代理商： S1C88848D0A0100
S1C88848 TECHNICAL MANUAL
EPSON
29
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Input Ports)
5.4 Input Ports (K ports)
5.4.1 Configuration of input ports
The S1C88848 is equipped with 10 input port bits
(K00–K07, K10 and K11) which are usable as
general purpose input port terminals with interrupt
function.
K10 and K11 terminals double as the external clock
(EVIN0 and EVIN2) input terminals of the
programmable timer (event counter) with input
port functions sharing the input signals. (See "5.10
Programmable Timer")
Each input port is equipped with a pull-up resistor.
The mask option can be used to select either "With
resistor" or "Gate direct" for each input port.
Figure 5.4.1.1 shows the structure of the input port.
Input
interrupt
circuit
VDD
VSS
Data
bus
Kxx
KxxD
Address
Mask
option
Fig. 5.4.1.1 Structure of input port
Each input port terminal is directly connected via a
three-state buffer to the data bus. Furthermore, the
input signal state at the instant of input port
readout is read in that form as data.
5.4.2 Mask option
Input port pull-up resistors
K00 .... ■
■ With resistor ■
■ Gate direct
K01 .... ■
■ With resistor ■
■ Gate direct
K02 .... ■
■ With resistor ■
■ Gate direct
K03 .... ■
■ With resistor ■
■ Gate direct
K04 .... ■
■ With resistor ■
■ Gate direct
K05 .... ■
■ With resistor ■
■ Gate direct
K06 .... ■
■ With resistor ■
■ Gate direct
K07 .... ■
■ With resistor ■
■ Gate direct
K10 .... ■
■ With resistor ■
■ Gate direct
K11 .... ■
■ With resistor ■
■ Gate direct
Input ports K00–K07, K10 and K11 are all equipped
with pull-up resistors. The mask option can be used
to select 'With resistor' or 'Gate direct' for each port
(bit).
The 'With resistor' option is rendered suitable for
purposes such as push switch or key matrix input.
When changing the input terminal from LOW level
to HIGH with the built-in pull-up resistor, a delay
in the waveform rise time will occur depending on
the time constant of the pull-up resistor and the
load capacitance of the terminal. It is necessary to
set an appropriate wait time for introduction of an
input port. In particular, special attention should be
paid to key scan for key matrix formation. Make
this wait time the amount of time or more calcu-
lated by the following expression.
Wait time = RIN x (CIN + load capacitance on the
board) x 1.6 [sec]
RIN: Pull up resistance Max. value
CIN: Terminal capacitance Max. value
When 'Gate direct' is selected, the pull-up resistor is
detached and the port is rendered suitable for
purposes such as slide switch input and interfacing
with other LSIs.
In this case, take care that a floating state does not
occur in input.
For unused input ports, select the default setting of
"With resistor".
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