EM785840/5841/5842
8-bit Micro-controller
Table4: Differences between EM78P5840, EM78P5841 and EM78P5842:
EM78P5840
EM78P5841
EM78P5842
Pin count
PWM
18
X
20
2 channel
18
24
2 channel
22
IO (MAX)
16
User Application Note
(Before using this chip, take a look at the following description note, it includes important messages.)
1. There are some undefined bits in the registers. The values in these bits are unpredicted. These
bits are not allowed to use. We use the symbol “-” in the spec to recognize them. A fixed value
must be write in some specific unused bits by software or some unpredicted wrong will occur.
2. You will see some names for the register bits definitions. Some name will be appear very
frequently in the whole spec. The following describes the meaning for the register’s definitions
such as bit type, bit name, bit number and so on.
RA
PAGE0
7
6
5
4
3
2
RAB2
R
1
0
RAB1
RAB7
R/W-0
RAB6
R/W-0
BAB5
R-1
RAB4
R/W-1
X
RAB0
R/W
R-0
read/write
(default value=1)
read/write
(w/o default value)
read/write
(default value=0)
read only
(w/o default value)
Bit type
Bit name
(undefined) not allowed to use
Bit number
read only
(default value=1)
read only
(default value=0)
Register name and its page
3. Please do not switch MCU operation mode from normal mode to sleep mode directly. Before
into sleep mode, please switch MCU to green mode.
4. While switching main clock (regardless of high freq to low freq or on the other hand), adding 6
instructions delay (NOP) is required.
5. Offset voltage will effect ADC’s result, please refer to figure 16 to detail.
__________________________________________________________________________________________________________________________________________________________________
* This specification is subject to change without notice.
1
2004/11/10 V1.2
ELAN [ ELAN MICROELECTRONICS CORP ]
