LAPIS Semiconductor ML610421, Руководство пользователя, Страница: 247 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Chapter 18 Port 1
18 – 1
18. Port 1
18.1 Overview
This LSI incorporates a 2-bit input port, Port 1 (P10, P11).
Port 1 can have a high-speed oscillation pin or an external clock input pin as a secondary function. When the port is
used as a high-speed oscillation pin, the P11 pin functions as an output pin if crystal/ceramic oscillation mode is selected
with the OSCM1–0 bits of the FCON0 register.
For high-speed oscillation and external clock input, see Chapter 6, “Clock Generation Circuit”.
18.1.1 Features
•
Allows selection of high-impedance input mode, input mode with a pull-down resistor, or input mode with a pull-up
resistor for each bit.
•
Allows selection of a high-speed crystal/ceramic resonator pin or an external clock input pin as a secondary function.
18.1.2 Configuration
Figure 18-1 shows the configuration of Port 1.
P1D : Port 1 data register
P1CON0 : Port 1 control register 0
P1CON1 : Port 1 control register 1
Figure 18-1 Configuration of Port 1
18.1.3 List of Pins
Pin name I/O Primary function Secondary function
P10/OSC0 I Input port
High-speed crystal/ceramic oscillation pin, external clock input
pin
P11/OSC1 I/O Input port High-speed crystal/ceramic oscillation pin
Data bus
P10, P11
P1CON0
P1CON1
High-speed
oscillation
circuit
V
DD
V
DD
V
SS
V
SS
2
OSCLK
2
STOP mode
1
Pull-up
Pull-down
Controller
P1D
ENOSC (oscillation enable)
2
2
FCON0
(OSCM1, OSCM0)