4501 datasheet(61/212 Pages) RENESAS

61 / 212 page

1-49

4501 Group

HARDWARE

Rev.2.01

Feb 07, 2005

REJ09B0192-0201

(5) External clock

When the external signal clock is used as the source oscillation

(f(XIN)), connect the XIN pin to the clock source and leave XOUT pin

open. Then, execute the CMCK instruction (Figure 47).

Be careful that the maximum value of the oscillation frequency

when using the external clock differs from the value when using the

ceramic resonator (refer to the recommended operating condition).

Also, note that the RAM back-up mode (POF and POF2 instruc-

tions) cannot be used when using the external clock.

(6) Clock control register MR

through register A with the TMRA instruction. In addition, the TAMR

instruction can be used to transfer the contents of register MR to

Table 19 Clock control register MR

Fig. 47 External clock input circuit

ROM ORDERING METHOD

Please submit the information described below when ordering

Mask ROM.

(1) Mask ROM Order Confirmation Form ..................................... 1

(2) Data to be written into mask ROM ............................... EPROM

(three sets containing the identical data)

(3) Mark Specification Form .......................................................... 1

✽For the mask ROM confirmation and the mark specifications,

refer to the “Renesas Technology Corp.” Homepage

(http://www.renesas.com/en/rom).

Note : “R” represents read enabled, and “W” represents write enabled.

MR3

Clock control register MR

System clock

f(XIN) (high-speed mode)

f(XIN)/2 (middle-speed mode)

f(XIN)/4 (low-speed mode)

f(XIN)/8 (default mode)

This bit has no function, but read/write is enabled.

at reset : 11002

at RAM back-up : 11002

MR3

R/W

Not used

System clock selection bits

MR2

MR1

MR0

MR2

4501

XIN

XOUT

External oscillation circuit

VDD

VSS

Execute the CMCK

instruction in program.

FUNCTION BLOCK OPERATIONS/ROM ORDERING METHOD

4501 Datasheet(PDF) 61 Page - Renesas Technology Corp

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