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10.7
Port E (PE.0–PE.3)
The ML63611 has Port E, a 4-bit input/output port.
Apart from the input/output port function, Port E has the functions of external interrupts, the function of RC
oscillator clock output for an A/D converter, the low-speed clock output function, and the high-speed clock output
function.
10.7.1 Port E Configuration
For the input port functions, there are the input modes of input with pull-up resistor, input with pull-down resistor,
and high impedance, or the output modes of P-channel open drain output, N-channel open drain output, CMOS
output, and high impedance, and one of the modes can be selected by the Port E control registers (PECON0 and
PECON1).
The external 2 interrupt has been assigned to PE.3.
The function of RC oscillator clock output for an A/D converter, the low-speed clock output function, and the
high-speed clock output function have been assigned to PE.0, PE.1, and PE.2, respectively. These functions can be
selected by the Port E mode register (PEMOD).
The circuit configuration for port E is shown in Figure 10-14.
4
PE.0–PE.3
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
V
DD
Output
port
control
V
SS
V
DD
Pull-up/
pull-down
control
V
SS
Figure 10-14 Input/Output Port (Port E) Configuration
Chapter 10 Ports (INPUT, I/O PORT)
PED
PEDIR
PECON0
PECON1
PEMOD
1
10 – 27
OPTION B (D): 1.5 V (3.0 V), With regulator
ML63611 User's Manual
Data bus
4
3
MON (from A/D
converter circuit),
TBCCLK (from low-
speed oscillation circuit),
HSCLK (from high-
speed oscillation circuit)
PE.3
(to external 2 interrupt
control circuit)
circuit for LCD bias
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