M30622ECTFP datasheet(43/184 Pages) MITSUBISHI

43 / 184 page

Tentative Specifications REV.A

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Specifications in this manual are tentative and subject to change.

Under

development

Clock Generating Circuit

Figure 1.13.4 shows the system clock control registers 0 and 1.

Figure 1.13.4. Clock control registers 0 and 1

System clock control register 0 (Note 1)

Symbol

Address

When reset

CM0

000616

4816

Bit name

Function

Bit symbol

0 0 : I/O port P57

0 1 : fC output

1 0 : f8 output

1 1 : f32 output

b1 b0

CM07

CM05

CM04

CM03

CM01

CM02

CM00

CM06

Clock output function

select bit

WAIT peripheral function

clock stop bit

0 : Do not stop f1, f8, f32 in wait mode

1 : Stop f1, f8, f32 in wait mode

XCIN-XCOUT drive capacity

select bit (Note 2)

0 : LOW

1 : HIGH

Port XC select bit

0 : I/O port

1 : XCIN-XCOUT generation

Main clock (XIN-XOUT)

stop bit (Note 4) (Note 5)

0 : On

1 : Off

Main clock division select

bit 0 (Note 2)

0 : CM16 and CM17 valid

1 : Division by 8 mode

System clock select bit

(Note 6)

0 : XIN, XOUT

1 : XCIN, XCOUT

Note 1: Set bit 0 of the protect register (address 000A16) to “1” before writing to this register.

Note 2: Changes to “1” when shiffing to stop mode.

Note 3: When entering power saving mode, main clock stops using this bit. When returning from stop

mode and operating with XIN, set this bit to “0”. When main clock oscillation is operating by

itself, set system clock select bit (CM07) to “1” before setting this bit to “1”.

Note 4: When inputting external clock, only clock oscillation buffer is stopped and clock input is acceptable.

Note 5: If this bit is set to “1”, XOUT turns “H”. The built-in feedback resistor remains ON, so XIN turns pulled

up to XOUT (“H”) via the feedback resistor.

Note 6: Set port Xc select bit (CM04) to “1” before writing to this bit. The both bits can not be written at

the same time.

System clock control register 1 (Note 1)

Symbol

Address

When reset

CM1

000716

2016

Bit name

Function

Bit symbol

CM10

All clock stop control bit

(Note4)

0 : Clock on

1 : All clocks off (stop mode)

Note 1: Set bit 0 of the protect register (address 000A16) to “1” before writing to this register.

Note 2: Changes to “1” when shiffing to stop mode.

Note 3: Can be selected when bit 6 of the system clock control register 0 (address 000616) is “0”.

If “1”, division mode is fixed at 8.

Note 4: If this bit is set to “1”, XOUT turns “H”, and the built-in feedback resistor turns null.

CM15

XIN-XOUT drive capacity

select bit (Note 2)

0 : LOW

1 : HIGH

CM16

CM17

Reserved bit

Always set to

“0”

Reserved bit

Always set to

“0”

Main clock division

select bit 1 (Note 3)

0 0 : No division mode

0 1 : Division by 2 mode

1 0 : Division by 4 mode

1 1 : Division by 16 mode

b7 b6

Reserved bit

Always set to

“0”

Reserved bit

Always set to

“0”

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