EM78451AP EMC [ELAN Microelectronics Corp], EM78451AP Datasheet - Page 16

• Manufacturer Part Number: EM78451AP
• Description: 8-Bit Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78451
8-Bit Microcontroller
12 •
TM1P (bit1~bit0): Timer1 Prescaler bit
4.2.5
4.2.6
Bit 0 (/WUE) This control bit is used to enable the wake-up function of P60~P67,
Bit 3 (ROC) ROC is used for the R-option. Setting ROC to "1" will enable the status of
Bit 4 (SLPC) This bit is set by hardware at the falling edge of wake-up signal and is
S7
7
7
-
“Timer1” on the subsequent pages.
pull-high function is disabled.
as“0,” pull high is enabled.
Refer to the Timer1 prescaler table for FOSC illustration under the section
The default values of /PU5, /PU6, /PU8, and /PU9 are “1” which means the
/PU6 and /PU9 are “AND” gating with /PHEN, that is, when each one is written
S7 defines the driving ability of the P70-P72.
0: Normal output.
1: Enhance the driving ability of LED.
IOCD (Pull-high Control Register)
IOCE (WDT Control Register)
cleared in software. SLPC is used to control the oscillator operation. The
oscillator is disabled (oscillator stops, and the controller enters the LEEP2
mode) on the high-to-low transition and is enabled (the controller is
awakened from SLEEP2 mode) on low-to-high transition. In order to
ensure the stable output of the oscillator, once the oscillator is enabled
again, there is a delay of approximately 18 ms (oscillator start-up timer
(OST)) before the next program instruction is executed. The OST is
R-option pins (P80, P81) to be read by the controller. Clearing ROC will
disable the R-option function. Otherwise, the R-option function is
introduced. Users must connect the P81 pin or/and P80 pin to VSS by a
560KΩ external resistor (Rex). If Rex is connected/disconnected with
VDD, the status of P80 (P81) will be read as "0"/"1" (refer to Fig. 7(b)).
The ROC bit can be read and written.
P74~P75, and P90~P91.
0: Enable the wake-up function.
1: Disable the wake-up function.
The /WUE bit can be read and written.
ODE
6
-
6
WDTE
5
-
5
SLPC
(This specification is subject to change without further notice)
4
-
4
/PU9
ROC
3
3
Product Specification (V1.2) 05.27.2004
/PU8
2
2
-
/PU6
1
1
-
/WUE
/PU5
0
0