em78f644nso28s ELAN Microelectronics Corp, em78f644nso28s Datasheet - Page 68

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

EM78F648/644/642/641/548/544/542/541N
8-Bit Microcontroller
58 •
6.3.12 Bank0 RF (Not Used)
6.3.13 Bank0 R10: EIESCR (External Interrupt Edge Select
Bits 7~1:
Bit 0 (EIES): External interrupt edge select bit
6.3.14 Bank0 R11: WDTCR
Bit 7 (WDTE): Watchdog Timer enable bit. WDTE is both readable and writable.
Bit 6 (EIS):
Bits 5 (INT): Interrupt enable flag
Bits 4:
Bit 3 (PSWE): Prescaler enable bit for WDT
Bits 2~0 (PSW2~PSW0): WDT Prescaler bits
WDTE
Bit 7
Bit 7
0
Bit 6
Bit 6
EIS
1: Rising edge interrupt
0: Disable WDT
1: Enable WDT
P60/ /INT switch control bit. EIS is both readable and writable.
0: P60
1: /INT, external interrupt pin. In this case, the I/O control bit of P60
0: Interrupt masked by DISI or hardware interrupt
1: Interrupt enabled by ENI/DISI instructions
Not used, fixed to “0” all the time.
Not used, fixed to “0” all the time.
0: Falling edge interrupt
0: Prescaler disabled, WDT rate is 1:1
1: Prescaler enabled, WDT rate is set from bits 2~0
0
PSW2
must be set to "1". When EIS is "0", the path of /INT is masked.
When EIS is "1", the status of /INT pin can also be read through
reading Port 6 (R6).
0
0
0
0
1
1
1
1
Bit 5
Bit 5
INT
0
PSW1
0
0
1
1
0
0
1
1
Bit 4
Bit 4
PSW0
0
0
Control Register)
(This specification is subject to change without further notice)
0
1
0
1
0
1
0
1
PSWE
Bit 3
Bit 3
WDT Rate
0
Product Specification (V1.0) 05.05.2010
1:2
1:4
1:8
1:16
1:32
1:64
1:128
1:256
PSW2
Bit 2
Bit 2
0
PSW1
Bit 1
Bit 1
0
PSW0
EIES
Bit 0
Bit 0