Z86C34 Datasheet, PDF (31/70 Pages) Zilog, Inc. – CMOS Z8 MCUs WITH ASCI UART OFFER EFFICIENT, COST-EFFECTIVE DESIGN FLEXIBILITY

ZiLOG
Z86C34/C35/C36/C44/C45/C46
CMOS Z8® MCUs with ASCI UART
REGISTER POINTER
7 654321 0
WorkingRegister
Group Pointer
Expanded Register
Group Pointer
%FF
%FO
Z8 Reg. File
%7F
Reserved
%0F
%00
Notes:
U = Unknown
†_{For ROMless Reset condition: “10110110”.}
*Will not be reset with a STOP-Mode Recovery.
**Will not be reset with a STOP-Mode Recovery, except bit D0.
X_{Not available on 28-pin packages.}
Z8^® STANDARD CONTROL REGISTERS
REGISTER
% FF
% FE
% FD
% FC
% FB
% FA
% F9
† _{% F8}
* % F7
* % F6
% F5
% F4
% F3
% F2
% F1
% F0
SPL
SPH
RP
FLAGS
IMR
IRQ
IPR
P01M
P3M
P2M
PRE0
T0
PRE1
T1
TMR
Reserved
RESET CONDITION
D7 D6 D5 D4 D3 D2 D1 D0
000000 0 0
000000 0 0
000000 0 0
UUUUUU U U
0 UUUUU U U
000000 0 0
UUUUUU U U
010011 0 1
000000 0 0
111111 1 1
UUUUUU U 0
UUUUUU U U
UUUUUU 0 0
UUUUUU U U
000000 0 0
EXPANDED REG. GROUP (F)
REGISTER
* ^{% (F) 0F}
% (F) 0E
* % (F) 0D
WDTMR
Reserved
SMR2
% (F) 0C
** % (F) 0B
Reserved
SMR
% (F) 0A
Reserved
% (F) 09
Reserved
% (F) 08
Reserved
% (F) 07
Reserved
% (F) 06
Reserved
% (F) 05
Reserved
% (F) 04
Reserved
% (F) 03
Reserved
% (F) 02
Reserved
% (F) 01
* _{% (F) 00}
Reserved
PCON
RESET CONDITION
UUU0 1 1 0 1
UUUUUU 0 0
00 10 00 0 0
11 1 1 11 1 0
EXPANDED REG. GROUP(0)
REGISTER
* ^{% (0) 03}
P3
* % (0) 02
P2
X _{% (0) 01}
P1
% (0) 00
P0
RESET CONDITION
1 1 1 1 UU U U
UU U U UU U U
UU U U UU U U
UU U U UU U U
Figure 19. Expanded Register File Architecture
Register File. The register file consists of four I/O port reg-
isters, 236 general-purpose registers and 15 control and sta-
tus registers (R0–R3, R4–R239 and R240–R255, respective-
ly), plus three system configuration registers in the
expanded register group. The instructions access registers
directly or indirectly through an 8-bit address field. As a re-
sult, a short, 4-bit register address can use the Register
Pointer (Figure 20). In the 4-bit mode, the register file is
divided into 16 working register groups, each occupying 16
DS007601-Z8X0499
PRELIMINARY
31