em78p210n ELAN Microelectronics Corp, em78p210n Datasheet - Page 19

• Manufacturer Part Number: em78p210n
• Description: 8-bit Microcontroller With Otp Rom
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.2) 04.22.2008
(This specification is subject to change without further notice)
Bit 6 (EIS0):
Bit 5 (CMPOUT): The result of the comparator output
Bit 4 ~ Bit 3 (CMPCOS1 ~ CMPCOS0): Comparator Select bits
Bits 2~0: not used, fixed to 0 all the time
6.2.19 Bank 1-RB (Pull-down Control Register)
Bank 1-RB register is both readable and writable
Bit 7 (/PD7):
Bit 6 (/PD6):
Bit 5 (/PD5):
Bit 4 (/PD4):
Bit 3 (/PD3):
Bit 2 (/PD2):
Bit 1 (/PD1):
Bit 0 (/PD0):
CMPCOS1 CMPCOS0
Bit 7
/PD7
0
0
1
1
When EIS is "0," the path of /INT is masked. When EIS is "1," the status of /INT
pin can also be read by way of reading Port 7 (Bank 0-R7). Refer to Figure 6-4
(I/O Port and I/O Control Register Circuit for P77 (/INT0) and P71 (/INT1) under
Section 6.4 (I/O Ports).
EIS0 and EIS1 are both readable and writable.
The highest priority of P71/INT1/CO is INT1. When EIS1=0, the working type of
P71/INT1/CO is determined by CMPCOS1 and CMPCOS0.
Bit 6
/PD6
Control bit is used to enable the pull-down of the P67 pin
Control bit used to enable the P66 pull-down pin
Control bit used to enable the P65 pull-down pin
Control bit used to enable the P64 pull-down pin
Control bit used to enable the P63 pull-down pin
Control bit used to enable the P62 pull-down pin
Control bit used to enable the P61 pull-down pin
Control bit used to enable the P60 pull-down pin
0 = Enable internal pull-down
1 = Disable internal pull-down
Control bit used to define the function of the P77 (/INT0) pin
0 = P77, normal I/O pin
1 = /INT0, external interrupt pin. In this case, the I/O control bit of P77
0
1
0
1
(Bit 7 of Bank 1-R7) must be set to "1"
/PD5
Bit 5
Comparator is not used. P72, P73, and P71 are normal I/O pins.
P72 and P73 are Comparator input pins and P71 is normal I/O pin.
P72 and P73 are Comparator input pins and P71 is Comparator
output pin (CO)
Used as OP and P71 is OP output pin (CO)
/PD4
Bit 4
NOTE
Function Description
Bit 3
/PD3
8-Bit Microcontroller with OTP ROM
/PD2
Bit 2
/PD1
Bit 1
EM78P210N
Bit 0
/PD0
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