Block Diagram
The AT8xC5112 has 3 software-selectable modes of reduced activity for further reduc-
tion in power consumption. In the idle mode, the CPU is frozen while the peripherals are
still operating. In the quiet mode, the A/D converter is only operating. In the Power-down
mode, the RAM is saved and all other functions are inoperative. Two oscillators source,
crystal and RC, provide a versatile power management.
The AT8xC5112 is proposed in 48-/52-pin count packages with Port 0 and Port 2
(address/
data buses).
(2)
XTAL1
Xtal
(2)
XTAL2
Osc
RC
Osc
RST
EA
ALE
PSEN
(2) (2)
CPU
EUART
BRG
RAM
256
x8
C51
CORE
IB-bus
ROM /OTP
8 K *8
(1) (1) (3)(3) (3) (3)
PCA
SPI
Watch
Dog
Timer 0 INT
Timer 1 Ctrl
(2)
(2) (3) (2) (3)
A/D
Converter
Parallel I/O Ports
Port 1 Port 3 Port 4 Port 0 Port 2
(3)
Notes: 1. Alternate function of Port 1.
2. Alternate function of Port 3.
3. Alternate function of Port 4.
2 AT8xC5112
4191C–8051–02/08