EM6540 EM Microelectronic, EM6540 Datasheet - Page 12

• Manufacturer Part Number: EM6540
• Description: (EM65xx) Mask Rom
• Manufacturer: EM Microelectronic

RC oscillator adjustment on the EM6505 (MFP version only)
On the EM6605 (ROM version), the adjustment of the RC oscillator is done by metal option
(refer to chapter 14 of the EM6605 datasheet).
On the EM6505 (MFP version), there is no metal option to adjust the frequency range.
Adjusting the 8 bits contained in registers “RC_Adj_Low” and “RC_adj_High” sets the
frequency. The bit “OscAdj[7]” selects the frequency range: low or high frequency range
(refer to chapter 4 of the EM6605 datasheet).
The others bits as well as the external resistor on Pin 10, are used to adjust more precisely
the frequency.
The frequency has to be in the range of 30kHz to 300kHz (refer to chapter 17.7 of the EM6605
datasheet).
Electrical specifications
Standard Operating Conditions
Cvreg : This capacitor maintains the Regulated Supply to the internal logic.
DC characteristics - Power Supply Pins
For Frequency range of 30 - 300 kHz
VDD=5.0V, T=25°C, f=32kHz (note1) (unless otherwise specified) Rext ≈ 330kΩ
Parameter
ACTIVE Supply Current
ACTIVE Supply Current
(in active mode)
STANDBY Supply Current
STANDBY Supply Current
(in Halt mode)
SLEEP Supply Current
SLEEP Supply Current
(SLEEP =1)
Regulated Voltage
Copyright © 2005, EM Microelectronic-Marin SA
Parameter
Temperature
VDD
VSS
Cvreg
Rext
RC_Adj_High
RC_Adj_Low
Register
name
add
hex
66
67
add
dec
102
103
Conditions
(note2) (note3)
0°C...+60°C
(note3)
0°C...+60°C
0°C...+60°C
power
b'3210
+25°C
(note3)
Vreg not at VDD
+25°C (note2)
+25°C
value
+2.0 ...+5.0V
50kΩ - 400kΩ
0001
1000
Value
min. 100nF
0 V (reference)
up
0°C...+60°C
0: OscAdj[0]
1: OscAdj[1]
2: OscAdj[2]
3: OscAdj[3]
0: OscAdj[4]
1: OscAdj[5]
2: OscAdj[6]
3: OscAdj[7]
write_bits
Read/Write_bits
Symb.
IVDDa
IVDDa
IVDDh
IVDDh
IVDDs
IVDDs
Vreg
Description
Vss
external R to set clock frequency
regulated voltage capacitor tow.
12
read_bits
Min.
----
----
1.5
(note1)
Typ.
30.0
17.0
1.0
2.0
Adjustment of RC oscillator
Adjustment of RC oscillator
Max.
Remarks
40.0
50.0
20.0
40.0
2.0
5.0
2.5
(4 MSB)
(4 LSB)
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EM65XX
Unit
µA
µA
µA
µA
µA
µA
V