Z86L972 Datasheet, PDF (57/91 Pages) Zilog, Inc. – Low-Voltage Microcontrollers

Z86L972/Z86L973/Z86L974
Low-Voltage Microcontrollers
50
Registers (Grouped by Function)
The following is a summary of the 37 special-purpose registers of the Z86L972/
Z86L973/Z86L974 family grouped by function. The following are the functional
groups:
• Flags and Pointers
• Interrupt Control
• I/O Port Control
• Timer Control—General-Purpose Timer (T1)
• Timer Control—T8 and T16 Timers
• Stop-Mode Recovery Control
For any of the registers described in this section (see Table 14), bits identified as
“Reserved” either do not exist (meaning they have not been implemented in this
design) or have a special purpose in a ZiLOG engineering or test environment.
Caution: Do not attempt to use these bits as the results are
unpredictable and meaningless.
Table 14. Register Description Locations
Address
Grp/Bnk Register
00h r2 (R2)
00h r4 (R4)
00h r5 (R5)
00h r6 (R6)
0Dh r0
0Dh r1
0Dh r2
0Dh r3
0Dh r4
0Dh r5
0Dh r6
0Dh r7
0Dh r8
0Dh r9
0Dh r10
0Dh r11
Register Function
Port 2 Data
Port 4 Data
Port 5 Data
Port 6 Data
T8 Timer Control
T8/T16 Control (A)
T16 Timer Control
T8/T16 Control (B)
T8 Low Load
T8 High Load
T16 Low Load
T16 High Load
T16 Low Capture
T16 High Capture
T8 Low Capture
T8 High Capture
Symbol
P2
P4
P5
P6
CTR0
CTR1
CTR2
CTR3
TC8L^†
TC8H^†
TC16L^†
TC16H^†
LO16^†
HI16^†
LO8^†
HI8^†
Location
page 61
page 62
page 62
page 64
page 70
page 67
page 73
page 69
page 72
page 72
page 75
page 75
page 74
page 74
page 71
page 71
PS010504-1002
PRELIMINARY