參數(shù)資料
型號(hào)： EM78P870
廠商： ELAN Microelctronics Corp .
元件分類： 8位微控制器
英文描述： 8 BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 21/48頁(yè)
文件大?。?/td> 313K
代理商： EM78P870
EM78P870
8-bit OTP Micro-controller
_________________________________________________________________________________________________________________________________________________________________
* This specification is subject to be changed without notice.
18
8/19/2004 (V1.5)
R9 (PORT9 I/O data, extra LCD address bit)
PAGE0 (PORT9 I/O data register)
7
6
P97
P96
P95
Bit 0 ~ Bit 7 (P90 ~ P97) : 8-bit PORT9(0~7) I/O data register
User can use IOC register to define input or output each bit.
PAGE1 (LCD address MSB bit)
7
6
5
LCDA8
0
0
Bit 0 ~ Bit 6 = 0 : unused
Bit 7 (LCDA8) : MSB of LCD address for LCD RAM reading or writing
Other LCD address bits LCDA7 ~ LCDA0 are set from RA PAGE1 Bit 7 ~ Bit 0.
For LCD address access over 0xFFH, set this bit to “1”; otherwise set this bit to “0”.
RA (CPU power saving, PLL, Main clock selection, Watchdog timer, LCD address)
PAGE0 (CPU power saving bit, PLL, Main clock selection bits, Watchdog timer enable bit)
7
6
5
4
3
0
PLLEN
CLK1
CLK0
0
Bit 0 (WDTEN) : Watch dog control register
User can use WDTC instruction to clear watch dog counter. The counter 's clock source is 32768/2 Hz. If
the prescaler assigns to TCC. Watch dog will time out by (1/32768 )*2 * 256 = 15.616ms. If the prescaler
assigns to WDT, the time of time out will be more times depending on the ratio of prescaler.
0/1
disable/enable
Bit 1~ Bit 2 = 1 : unused
Bit 3 = 0 : unused
Bit 4 ~ Bit 5 (CLK0 ~ CLK1) : Main clock selection bits
User can choose different frequency of main clock by CLK1 and CLK2. All the clock selection is list below.
PLLEN
CLK1
CLK0
Sub clock
1
0
0
32.768kHz
1
0
1
32.768kHz
1
1
0
32.768kHz
1
1
1
32.768kHz
0
Don’t care
don’t care
32.768kHz
0
Don’t care
don’t care
32.768kHz
0
Don’t care
don’t care
32.768kHz
0
Don’t care
don’t care
32.768kHz
Bit 6 (PLLEN) : PLL enable control bit
It is CPU mode control register. If PLL is enabled, CPU will operate at normal mode (high frequency,main
clock); otherwise, it will run at green mode (low frequency, 32768 Hz).
0/1
disable/enable
5
4
3
2
1
0
P94
P93
P92
P91
P90
4
0
3
0
2
0
1
0
0
0
2
1
1
1
0
WDTEN
MAIN clock
895.658kHz
1.7913MHz
10.7479MHz
3.5826MHz
don’t care
don’t care
don’t care
don’t care
CPU clock
895.658kHz (Normal mode)
1.7913MHz (Normal mode)
10.7479MHz (Normal mode)
3.5826MHz (Normal mode)
32.768kHz (Green mode)
32.768kHz (Green mode)
32.768kHz (Green mode)
32.768kHz (Green mode)
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