NEC UPD789026 Series, User Manual

Page: 97 / 213

CHAPTER 6 16-BIT TIMER
User's Manual U11919EJ3V0UM00
97
Figure 6-2. 16-Bit Timer Mode Control Register 20 Format
TOC20
0
1
CPT201
0
0
1
1
CPT200
0
1
0
1
Capture operation disabled
Rising edge of CPT2
Falling edge of CPT2
Both edges of CPT2
TOF20
0
1 Set by overflow of 16-bit timer
Timer Output Data Inverse Control
Inverse disabled
Inverse enabled
Capture Edge Selection
TOE20
0
1
TCL201
0
0
TCL200
0
1
f
X
/2
2
(1.25 MHz)
f
X
/2
6
(78.1 kHz)
16-bit Timer 20 Output Control
Output disabled (port mode)
Output enabled
16-bit Timer Counter 20 Count Clock Selection
Overflow Flag Set
Clear by reset and software
TOD20
0
1
Timer output data is 1.
Timer Output Data
Timer output data is 0.
TOD20 TOF20 CPT201 CPT200 TOC20 TCL201 TCL200 TOE20 TMC20
R/W
FF5BH 00H R/W
<6> 5 4 3 2 1 7 <0>
Symbol
Address After Reset
Note
Other than above Setting prohibited
Note Bit 7 is read-only.
Remarks 1. f
X
: System clock oscillation frequency
2. The parenthesized values apply to operation at f
X
= 5.0 MHz.
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