HD6473258P10 Renesas Electronics America, HD6473258P10 Datasheet - Page 203

• Manufacturer Part Number: HD6473258P10
• Description: IC H8 MCU OTP 32K 64DIP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/325r

Specifications of HD6473258P10

• Core Processor: H8/300
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: SCI, UART/USART
• Number Of I /o: 53
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 64-DIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Peripherals: -

10.1 Overview
The H8/3257 and H8/3256 have 2 Kbytes of on-chip static RAM, H8/325 and H8/324 have
1 Kbyte, the H8/323 has 512 bytes, and the H8/322 has 256 bytes. The on-chip RAM is connected
to the CPU by a 16-bit data bus. Both byte and word access to the on-chip RAM are performed in
two states, enabling rapid data transfer and instruction execution.
The on-chip RAM occupies the following addresses in the chip’s address space.
H8/3257, H8/3256: H'F780 to H'FF7F
H8/325, H8/324: H'FB80 to H'FF7F
H8/323: H'FD80 to H'FF7F
H8/322: H'FE80 to H'FF7F
The RAME bit in the system control register (SYSCR) can enable or disable the on-chip RAM,
permitting these addresses to be allocated to external memory instead, if so desired.
10.2 Block Diagram
Figure 10-1 is a block diagram of the on-chip RAM.
Figure 10-1. Block Diagram of On-Chip RAM (H8/3257)
Address
H'F780
H'F782
H'FF7E
Section 10. RAM
Even address
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'F780
H'F782
H'FF7E
On-chip RAM
197
Odd address
H'F781
H'F783
H'FF7F
Fig 10-1