EM65XX

Copyright

© 2005, EM Microelectronic-Marin SA

12

www.emmicroelectronic.com

RC oscillator adjustment on the EM6505 (MFP version only)

Register

name

add

hex

add

dec

power

up

value

write_bits

read_bits

Remarks

b'3210

Read/Write_bits

RC_Adj_Low

66

102

0001

0: OscAdj[0]

1: OscAdj[1]

2: OscAdj[2]

3: OscAdj[3]

----

Adjustment of RC oscillator

(4 LSB)

RC_Adj_High

67

103

1000

0: OscAdj[4]

1: OscAdj[5]

2: OscAdj[6]

3: OscAdj[7]

----

Adjustment of RC oscillator

(4 MSB)

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

Parameter

Value

Description

Temperature

0°C...+60°C

VDD

+2.0 ...+5.0V

VSS

0 V (reference)

Cvreg

min. 100nF

regulated voltage capacitor tow.

Vss

Rext

50k

Ω - 400kΩ

external R to set clock frequency

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

Conditions

Symb.

Min.

Typ.

(note1)

Max.

Unit

ACTIVE Supply Current

+25°C (note2)

IVDDa

30.0

40.0

µA

ACTIVE Supply Current

(in active mode)

(note2) (note3)

0°C...+60°C

IVDDa

50.0

µA

STANDBY Supply Current

+25°C

IVDDh

17.0

20.0

µA

STANDBY Supply Current

(in Halt mode)

(note3)

0°C...+60°C

IVDDh

40.0

µA

SLEEP Supply Current

+25°C

IVDDs

1.0

2.0

µA

SLEEP Supply Current

(SLEEP =1)

(note3)

0°C...+60°C

IVDDs

5.0

µA

Regulated Voltage

Vreg not at VDD

Vreg

1.5

2.0

2.5

V