NEC mPD789101, User Manual

Page: 108 / 265

CHAPTER 8 16-BIT TIMER COUNTER
User’s Manual U13045EJ2V0UM00
108
Figure 8-2. 16-Bit Timer Mode Control Register 20 Format
Note Bit 7 is read-only.
Remark f
X
: System clock oscillation frequency (ceramic/crystal oscillation)
f
CC
: System clock oscillation frequency (RC oscillation)
CPT201
0
0
1
1
CPT200
0
1
0
1
Capture operation disabled
Rising edge of CPT20
Falling edge of CPT20
Both edges of CPT20
TOF20
0
1 Set by overflow of 16-bit timer
TOC20
0
1
Timer output data inverse control
Inverse disabled
Inverse enabled
TOD20
0
1
Timer output data
Timer output of 0
Timer output of 1
Capture edge selection
TOE20
0
1
TCL201
0
0
Other than above
TCL200
0
1
f
X
/2
2
(1.25 MHz)
f
X
/2
6
(78.1 kHz)
Setting prohibited
16-bit timer register 20 output control
Output disabled (port mode)
Output enabled
16-bit timer register 20 count clock selection
Overflow flag set
Clear by reset and software
1
TOD20 TOF20 CPT201 CPT200 TOC20 TCL201 TCL200 TOE20 TMC20
R/W
FF48H 00H R/W
<6> 5 4 3 2 1 7 <0>
Symbol
Address After reset
Note
At f
X
= 5.0 MHz At f
CC
= 4.0 MHz
f
CC
/2
2
(1.0 MHz)
f
CC
/2
6
(62.5 kHz)