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King Billion Electronics Co., Ltd
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億
電
子
股
份
有
限
公
司
HE83005
HE80000 SERIES
July 28, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
5
V3.4
SXI
SXI
SXO
SXO
Crystal Osc.
RC Osc.
Mask Option
Description
MO_SXTAL
0: RC Oscillator.
1: Crystal Oscillator.
0: Slow clock enable
1: Slow clock disable
MO_SCKN
With two clock sources available, the system can switch among operation modes of Normal, Slow, Idle,
and Sleep modes by the setting of OP1 and OP2 registers as shown in tables below to suit the needs of
application such as power saving, etc.
OP1
Bit 7
Bit 6
Bit 5
Bit 4
Field
DRDY
STOP
SLOW
INTE
Mode
R/W
R/W
R/W
R/W
Reset
1
0
0
0
OP2
Bit 7
Bit 6
Bit 5
Bit 4
Field
IDLE
PNWK
TCWK
-
Mode
R/W
R
R
-
Reset
0
-
-
-
6.
General Purpose I/O
The PRTC[7..0] and PRTD[7..0] are dedicated general purpose I/O port. All the I/O ports are
Bit 3
T2E
R/W
0
Bit 2
T1E
R/W
0
Bit 1
Z
R/W
-
Bit 0
C
R/W
-
Bit 3
Bit 2
Bit 1
Bit 0
-
-
-
-
-
-
-
-
-
bi-directional and non-tristate output structure. The output has weak sourcing (50
μ
A) and stronger
sinking (1mA) capability and each can be configured as push-pull or open-drain output structure
individually by mask option.
When the I/O port is used as input, the weakly high sourcing can be used as weakly pull-up. Open drain
can be used if the pull-up is not required and let the external driver to drive the pin. Please note that a
floating pad could cause more power consumption since the noise could interfere with the circuit and
cause the input to toggle. A ‘1’ needs to be written to port first before reading the input data from the I/O
pin. If the PMOS is used as pull-up, care should be taken to avoid the constant power drain by DC path
between pull-up and external circuit.
The input port has built-in Schmidt trigger to prevent it from chattering. The hysteresis level of Schmidt
trigger is 1/3*VDD.