NEC mPD784225 Series User Manual page 210

(2) Prescaler mode registers 5 and 6 (PRM5, PRM6)
This register sets the count clock of 8-bit timer counters 5 and 6 (TM5, TM6).
PRM5 and PRM6 are set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PRM5 and PRM6 to 00H.
Figure 10-4. Format of Prescaler Mode Register 5 (PRM5)
Address: 0FF6CH After reset: 00H R/W
Symbol 7
PRM5 0
Cautions 1. If writing data different than that of PRM5 is written, stop the timer beforehand.
2. Be sure to set bits 3 to 7 of PRM5 to 0.
Remark Values in parentheses apply to operation at f
210
CHAPTER 10 8-BIT TIMERS 5, 6
6 5
0 0
TCL52 TCL51 TCL50
0 1
0 1
1 0
1 0
1 1
1 1
Other than above
User's Manual U12697EJ3V0UM
4 3 2
0 0 TCL52
Count clock selection
0 f /4 (3.13 MHz)
XX
1 f /8 (1.56 MHz)
XX
0 f /16 (781 kHz)
XX
1 f /32 (391 kHz)
XX
0 f /128 (97.6 kHz)
XX
1 f /512 (24.4 kHz)
XX
Setting prohibited
= 12.5 MHz.
XX
1 0
TCL51 TCL50