em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 55

• Manufacturer Part Number: em78f644nso28s
• Description: Flash Series 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 05.05.2010
(This specification is subject to change without further notice)
Bit 6 (EIS):
Bits 5 ~ 4:
Bit 3 (PSWE): Prescaler enable bit for WDT
Bit 2 ~ Bit 0 (PSW2 ~ PSW0): WDT prescaler bits
6.2.9 IOCB (Pull-Down Control Register 2)
Bit 7 (/PD63): Control bit used to enable pull-down of the P63 pin.
Bit 6 (/PD62): Control bit used to enable pull-down on P62 pin
Bit 5 (/PD61): Control bit used to enable pull-down on P61 pin
Bit 4 (/PD60): Control bit used to enable pull-down on P60 pin
Bit 3 (/PD53): Control bit used to enable pull-down on P53 pin
Bit 2 (/PD52): Control bit used to enable pull-down on P52 pin
Bit 1 (/PD51): Control bit used to enable pull-down on P51 pin
Bit 0 (/PD50): Control bit used to enable pull-down on P50 pin
/PD63
Bit 7
/PD62
Bit 6
Control bit used to define the P60 (/INT) pin function
0: P60, bidirectional I/O pin
1: /INT, external interrupt pin. In this case, the I/O control bit of P60
When EIS is "0", the /INT path is masked. When EIS is "1", the status
of the /INT pin can also be read by way of reading Port 6 (R6).
The EIS is both readable and writable.
Not used, set to “0” all the time
0: Prescaler disable bit. WDT rate is 1:1
1: Prescaler enable bit. WDT rate is set at Bit 0~Bit 2
0: Enable internal pull-down
1: Disable internal pull-down
PSW2
(Bit 0 of IOC6) must be set to "1".
0
0
0
0
1
1
1
1
/PD61
Bit 5
PSW1
0
0
1
1
0
0
1
1
EM78F648/644/642/641/548/544/542/541N
/PD60
Bit 4
PSW0
0
1
0
1
0
1
0
1
/PD53
Bit 3
WDT Rate
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:256
/PD52
Bit 2
8-Bit Microcontroller
/PD51
Bit 1
/PD50
Bit 0
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