9-13
PROGRAMMABLE COUNTER ARRAY
Figure 9-7. CMOD: PCA Timer/Counter Mode Register
CMOD
Address:
S:D9H
Reset State:
00XX X000B
7
0
CIDL
WDTE
—
—
—
CPS1
CPS0
ECF
Bit
Number
Bit
Mnemonic
Function
7
CIDL
PCA Timer/Counter Idle Control:
CIDL = 1 disables the PCA timer/counter during idle mode. CIDL = 0
allows the PCA timer/counter to run during idle mode.
6
WDTE
Watchdog Timer Enable:
WDTE = 1 enables the watchdog timer output on PCA module 4.
WDTE = 0 disables the PCA watchdog timer output.
5:3
—
Reserved:
The values read from these bits are indeterminate. Write zeros to these
bits.
2:1
CPS1:0
PCA Timer/Counter Input Select:
CPS1 CPS0
0
0
F
OSC
/12
0
1
F
OSC
/4
1
0
Timer 0 overflow
1
1
External clock at ECI pin (maximum rate = F
OSC
/8 )
0
ECF
PCA Timer/Counter Interrupt Enable:
ECF = 1 enables the CF bit in the CCON register to generate an interrupt
request.
Summary of Contents for 8XC251SA
Page 2: ......
Page 3: ...May 1996 8XC251SA 8XC251SB 8XC251SP 8XC251SQ Embedded Microcontroller User s Manual...
Page 18: ......
Page 19: ...1 Guide to This Manual...
Page 20: ......
Page 30: ......
Page 31: ...2 Architectural Overview...
Page 32: ......
Page 41: ...3 Address Spaces...
Page 42: ......
Page 63: ...4 Device Configuration...
Page 64: ......
Page 81: ...5 Programming...
Page 82: ......
Page 102: ......
Page 103: ...6 Interrupt System...
Page 104: ......
Page 120: ......
Page 121: ...7 Input Output Ports...
Page 122: ......
Page 132: ......
Page 133: ...8 Timer Counters and Watchdog Timer...
Page 134: ......
Page 153: ...9 Programmable Counter Array...
Page 154: ......
Page 170: ......
Page 171: ...10 Serial I O Port...
Page 172: ......
Page 187: ...11 Minimum Hardware Setup...
Page 188: ......
Page 197: ...12 Special Operating Modes...
Page 198: ......
Page 206: ......
Page 207: ...13 External Memory Interface...
Page 208: ......
Page 239: ...14 Programming and Verifying Nonvolatile Memory...
Page 240: ......
Page 250: ......
Page 251: ...A Instruction Set Reference...
Page 252: ......
Page 390: ......
Page 391: ...B Signal Descriptions...
Page 392: ......
Page 400: ......
Page 401: ...C Registers...
Page 402: ......
Page 436: ......
Page 437: ...Glossary...
Page 438: ......
Page 446: ......
Page 447: ...Index...
Page 448: ......
Page 458: ......