upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 462

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

(2)
Cautions: 1. Do not rewrite the PRSCM0 register while the watch timer is operating.
13.9.2 Generation of count clock
The clock input to the watch timer or CSIB0 (f
The relationship between the main clock (f
BGCS01 (m), set value of the PRSCM0 register (N), and output clock (f
Remark:
462
PRSCM0 PRSCM07 PRSCM06 PRSCM05 PRSCM04 PRSCM03 PRSCM02 PRSCM01 PRSCM00 FFFFF8B1H R/W 00H
Symbol
Prescaler compare register 0 (PRSCM0)
This is an 8-bit compare register.
It can be read or written in 8-bit units.
Reset input clears this register to 00H.
Example:
Where f
f
BGR
= 32.787 kHz
2. Set the PRSCM0 register before setting the BGCE0 bit of the PRSM0 register to 1.
f
N:
m:
BRG
7
X
= 8.00 MHz, m = 0 (BGCS01 bit = BGCS00 bit = 0), and N = 7AH
:
Figure 13-26: Prescaler Compare Register 0 (PRSCM0) Format
Count clock
Set value of PRSCM0 register (01H to FFH)
N = 256 if the set value of the PRSCM0 register is 00H.
Set value of BGCS01 and BGSC00 bits (00B to 11B)
6
Chapter 13 3-Wire Serial Interface (CSIB)
5
User’s Manual U16702EE3V2UD00
4
f
BRG
X
BRG
), set value of count clock selection bits BGCS00 and
=
3
) can be corrected to 32.768 kHz.
2
m
× N × 2
f
X
2
1
BGR
0
) is as follows.
Address
R/W
Reset
After