4507 datasheet(59/216 Pages) RENESAS

59 / 216 page

1-47

4507 Group

HARDWARE

Rev.2.01

Feb 04, 2005

REJ09B0195-0201

(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 45).

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 (POF2 instruction) 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. 45 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

4507

XIN

XOUT

External oscillation circuit

VDD

VSS

Execute the CMCK

instruction in program.

FUNCTION BLOCK OPERATIONS

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