cia.inc.html; generated on Fri Sep 18 21:44:54 2015 by ca65html
uz@cc65.org
1: CIA_O_PA := 0
2: CIA_O_PB := 1
3: CIA_O_DDRA := 2
4: CIA_O_DDRB := 3
5: CIA_O_TALO := 4
6: CIA_O_TAHI := 5
7: CIA_O_TBLO := 6
8: CIA_O_TBHI := 7
9: CIA_O_TOD10THS := 8
10: CIA_O_TODSEC := 9
11: CIA_O_TODMIN := 10
12: CIA_O_TODHR := 11
13: CIA_O_SDR := 12
14: CIA_O_ICR := 13
15: CIA_O_CRA := 14
16: CIA_O_CRB := 15
17:
18: CIA_ICR_B_TA := $01 ; bit: timer A underflow
19: CIA_ICR_B_TB := $02 ; bit: timer B underflow
20: CIA_ICR_B_TOD := $04 ; bit: TOD alarm
21: CIA_ICR_B_SP := $08 ; bit: Serial port full/empty
22: CIA_ICR_B_FLAG := $10 ; bit: external -FLAG
23: CIA_ICR_B_UNUSED := $60
24: CIA_ICR_BR_IR := $80 ; bit: any interrupt occurred (read-only)
25: CIA_ICR_BW_SET := $80 ; bit: set (=1) or clear (=0) bit (write-only)
26: CIA_ICR_BW_UNSET := $00 ;
27:
28: CIA_CRA_B_START := $01 ; 1 = start timer A, 0 = stop timer A
29: CIA_CRA_B_PBON := $02 ; 1 = timer A output appears on PB6, 0 = PB6 is not affected by timer
30: CIA_CRA_B_TOGGLE := $04 ; PB6 output mode: 1 = toggle, 0 = pulse
31: CIA_CRA_B_ONESHOT := $08 ; 1 = one shot timer, 0 = continuous mode
32: CIA_CRA_B_FORCE_LOAD := $10 ; 1 = force load (this is a strobe, that is, it will always be read as "0")
33: CIA_CRA_B_COUNT_CNT := $20 ; 1 = timer A counts positive edges of CNT, 0 = timer A counts PHI2 pulses
34: CIA_CRA_B_SP_OUTPUT := $40 ; 1 = serial port (SP) is output, 0 = it is input
35: CIA_CRA_B_50HZ := $80 ; 1 = 50Hz clock at TOD, 0 = 60Hz clock
36:
37: CIA_CRB_B_START := $01 ; 1 = start timer B, 0 = stop timer B
38: CIA_CRB_B_PBON := $02 ; 1 = timer B output appears on PB7, 0 = PB7 is not affected by timer
39: CIA_CRB_B_TOGGLE := $04 ; PB7 output mode: 1 = toggle, 0 = pulse
40: CIA_CRB_B_ONESHOT := $08 ; 1 = one shot timer, 0 = continuous mode
41: CIA_CRB_B_FORCE_LOAD := $10 ; 1 = force load (this is a strobe, that is, it will always be read as "0")
42: CIA_CRB_B_TOD_ALARM := $80 ; 1 = writing to TOD registers sets ALARM, 0 = writing to TOD registers sets time-of-day
43:
44: CIA_CRB_B_MODE_MASK := $60 ; mask bits for setting the timer B count mode
45: CIA_CRB_B_MODE_PHI2 := $00 ; timer B counts PHI2 pulses
46: CIA_CRB_B_MODE_CNT := $20 ; timer B counts positive edges of CNT
47: CIA_CRB_B_MODE_TA_ := $40 ; timer B counts timer A underflows
48: CIA_CRB_B_MODE_TA_WITH_CNT := $60 ; timer B counts timer A underflows which occur while CNT is high