M16CSLASH26 datasheet(39/239 Pages) RENESAS

39 / 239 page

Clock Generating Circuit

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.8.4b. Peripheral clock select register

Figure 1.8.4c. Processor mode register 2

Function

Bit symbol

Bit name

Processor mode register 2 (Note 1)

Symbol

Address

When reset

PM2

001E16

XXX000002

PM20

Specifying wait when

accessing SFR registers

(Note 2)

0 : 2 waits

1 : 1 wait

00 0 0

Must always be set to "0"

Reserved bit

Nothing is assigned.

Writes must set each bit to "0". Read values are indeterminate.

PM24

P85/NMI configuration bit

(Notes 3,6,7)

0: P85 function (NMI disable)

1: NMI function

Note 1: Set bit 1 of the protect register (address 000A16) to "1" before writing new values

to this register.

Note 2: When the system clock is 16Mhz and more, must set to 2 waits.

Note 3: This bit cannot be changed from "1" to "0" in software.

Note 4: Setting PM21 to "1" results in the following:

• BCLK is not halted by WAIT instruction.

• Writing to the following bits has no effect:

CM02, of register CM0

CM05, of register CM0 (main clock is not halted)

CM07, of register CM0 (CPU clock source does not change)

CM10, of register CM1 (stop mode is not entered)

CM20, of register CM2 (oscillation stop, re-oscillation detection function settings

do not change)

Note 5: Setting PM22 to "1" results in the following:

• The ring oscillator starts oscillating, and the ring oscillator clock becomes the

watchdog timer count source.

• Writing to CM10 disabled (stop mode is not entered).

• Watchdog timer does not stop when in wait mode or hold state.

Note 6: For NMI function, this bit must be set to "1" in first instruction after reset.

Note 7: When this bit is set to "1", the P85 direction register must be "0".

System clock protective bit

(Notes 3,4)

0 : Clock is protected by PRCR

1 : Clock modification disabled

PM21

WDT count source

protective bit (Notes 3,5)

0 : CPU clock is used for the

watchdog timer count source

1 : Ring oscillator clock is used

for the watchdog timer count

source

PM22

Function

Bit symbol

Bit name

Peripheral clock select register (Note)

Symbol

Address

When reset

PCLKR

025E16

0316

PCLK0

Timers A, B clock select bit

(Clock source for the

timers A, B, and the dead

time timer)

0 : f2

1 : f1

00 0

Reserved bit

Must always be set to

Note: Set the bit 0 of the protect register (address 000A16) to "1" before rewriting

this register.

00 0

PCLK1

SI/O clock select bit

(Clock source for UART0

to UART2)

0 : f2SIO

1 : f1SIO

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